No Internet after some time on GL-E750

Hi all,

recently, my Mudi (GL-E750) has some modem issues. Specifially, after some time, the display says "No Internet" and after connecting to the web interface, the "Cellular" infobox reads
"No Modem device found. Plug in your USB modem to start."

Restarting the router works, but it is infeasible to restart the router every 5 minutes.

Attached is the dmesg log. Seems like there is some internal problem with the modem.
Can somebody help me? Thanks in advance!

 [    0.000000] Linux version 5.10.176 (gl-ci@gl-ci-server) (mips-openwrt-linux-musl-gcc (OpenWrt GCC 11.2.0 r20123-38ccc47687) 11.2.0, GNU ld (GNU Binutils) 2.37) #0 Sun Apr 9 12:27:46 2023
[    0.000000] printk: bootconsole [early0] enabled
[    0.000000] CPU0 revision is: 00019374 (MIPS 24Kc)
[    0.000000] MIPS: machine is GL.iNet GL-E750
[    0.000000] SoC: Qualcomm Atheros QCA9533 ver 2 rev 0
[    0.000000] Initrd not found or empty - disabling initrd
[    0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[    0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[    0.000000] Zone ranges:
[    0.000000]   Normal   [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
[    0.000000] On node 0 totalpages: 32768
[    0.000000]   Normal zone: 288 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 32768 pages, LIFO batch:7
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 32480
[    0.000000] Kernel command line: console=ttyS0,115200n8 rootfstype=squashfs,jffs2
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes, linear)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes, linear)
[    0.000000] Writing ErrCtl register=00000000
[    0.000000] Readback ErrCtl register=00000000
[    0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[    0.000000] Memory: 120000K/131072K available (6401K kernel code, 597K rwdata, 1340K rodata, 1188K init, 214K bss, 11072K reserved, 0K cma-reserved)
[    0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[    0.000000] NR_IRQS: 51
[    0.000000] CPU clock: 650.000 MHz
[    0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 5880801374 ns
[    0.000008] sched_clock: 32 bits at 325MHz, resolution 3ns, wraps every 6607641598ns
[    0.008323] Calibrating delay loop... 432.53 BogoMIPS (lpj=2162688)
[    0.074928] pid_max: default: 32768 minimum: 301
[    0.079971] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.087676] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.098219] dyndbg: Ignore empty _ddebug table in a CONFIG_DYNAMIC_DEBUG_CORE build
[    0.109346] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[    0.119769] futex hash table entries: 256 (order: -1, 3072 bytes, linear)
[    0.127061] pinctrl core: initialized pinctrl subsystem
[    0.137520] NET: Registered protocol family 16
[    0.143044] thermal_sys: Registered thermal governor 'step_wise'
[    0.207351] clocksource: Switched to clocksource MIPS
[    0.220438] NET: Registered protocol family 2
[    0.225278] IP idents hash table entries: 2048 (order: 2, 16384 bytes, linear)
[    0.233816] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes, linear)
[    0.242762] TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.250867] TCP bind hash table entries: 1024 (order: 0, 4096 bytes, linear)
[    0.258316] TCP: Hash tables configured (established 1024 bind 1024)
[    0.265183] UDP hash table entries: 256 (order: 0, 4096 bytes, linear)
[    0.272140] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes, linear)
[    0.279857] NET: Registered protocol family 1
[    0.284484] PCI: CLS 0 bytes, default 32
[    0.295644] workingset: timestamp_bits=14 max_order=15 bucket_order=1
[    0.307453] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[    0.313608] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[    0.325996] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
[    0.337336] pinctrl-single 1804002c.pinmux: 576 pins, size 72
[    0.344323] gpio-export gpio-export: 4 gpio(s) exported
[    0.350708] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[    0.359978] printk: console [ttyS0] disabled
[    0.364565] 18020000.uart: ttyS0 at MMIO 0x18020000 (irq = 9, base_baud = 1562500) is a 16550A
[    0.373730] printk: console [ttyS0] enabled
[    0.382798] printk: bootconsole [early0] disabled
[    0.413389] spi-nand spi0.1: Macronix SPI NAND was found.
[    0.419066] spi-nand spi0.1: 128 MiB, block size: 128 KiB, page size: 2048, OOB size: 64
[    0.430345] 1 fixed-partitions partitions found on MTD device (null)
[    0.436929] Creating 1 MTD partitions on "(null)":
[    0.441939] 0x000000000000-0x000008000000 : "ubi"
[    0.554523] spi-nor spi0.0: w25q128 (16384 Kbytes)
[    0.559630] 6 fixed-partitions partitions found on MTD device spi0.0
[    0.566235] OF: Bad cell count for /ahb/spi@1f000000/flash@0/partitions
[    0.573112] OF: Bad cell count for /ahb/spi@1f000000/flash@0/partitions
[    0.580443] Creating 6 MTD partitions on "spi0.0":
[    0.585410] 0x000000000000-0x000000040000 : "u-boot"
[    0.595116] 0x000000040000-0x000000050000 : "u-boot-env"
[    0.601807] 0x000000050000-0x000000060000 : "art"
[    0.609646] 0x000000060000-0x000000460000 : "kernel"
[    0.615923] 0x000000460000-0x000000fe0000 : "reserved"
[    0.624090] 0x000000fe0000-0x000001000000 : "log"
[    1.257824] mdio.0:1f: Found an AR934X built-in switch
[    1.659421] ag71xx 19000000.eth: connected to PHY at mdio.0:1f:04 [uid=004dd042, driver=Generic PHY]
[    1.669593] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode: mii
[    1.677796] NET: Registered protocol family 10
[    1.689095] Segment Routing with IPv6
[    1.693017] NET: Registered protocol family 17
[    1.697777] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[    1.711177] 8021q: 802.1Q VLAN Support v1.8
[    1.721009] PCI host bridge /ahb/pcie-controller@180c0000 ranges:
[    1.727407]  MEM 0x0000000010000000..0x0000000013ffffff
[    1.732802]   IO 0x0000000000000000..0x0000000000000000
[    1.738404] PCI host bridge to bus 0000:00
[    1.742650] pci_bus 0000:00: root bus resource [mem 0x10000000-0x13ffffff]
[    1.749791] pci_bus 0000:00: root bus resource [io  0x0000]
[    1.755552] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[    1.762570] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[    1.770815] pci 0000:00:00.0: [168c:0050] type 00 class 0x028000
[    1.777055] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x001fffff 64bit]
[    1.784126] pci 0000:00:00.0: reg 0x30: [mem 0x00000000-0x0000ffff pref]
[    1.791155] pci 0000:00:00.0: supports D1
[    1.795297] pci 0000:00:00.0: PME# supported from D0 D1 D3hot
[    1.802341] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00
[    1.809240] pci 0000:00:00.0: BAR 0: assigned [mem 0x10000000-0x101fffff 64bit]
[    1.816813] pci 0000:00:00.0: BAR 6: assigned [mem 0x10200000-0x1020ffff pref]
[    1.828429] UBI: auto-attach mtd0
[    1.831898] ubi0: attaching mtd0
[    4.402375] ubi0: scanning is finished
[    4.438761] ubi0: attached mtd0 (name "ubi", size 128 MiB)
[    4.444449] ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
[    4.451605] ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 2048
[    4.458636] ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096
[    4.465822] ubi0: good PEBs: 1023, bad PEBs: 1, corrupted PEBs: 0
[    4.472124] ubi0: user volume: 2, internal volumes: 1, max. volumes count: 128
[    4.479587] ubi0: max/mean erase counter: 3/1, WL threshold: 4096, image sequence number: 1681043266
[    4.489020] ubi0: available PEBs: 0, total reserved PEBs: 1023, PEBs reserved for bad PEB handling: 19
[    4.498750] ubi0: background thread "ubi_bgt0d" started, PID 324
[    4.508123] block ubiblock0_0: created from ubi0:0(rootfs)
[    4.513808] ubiblock: device ubiblock0_0 (rootfs) set to be root filesystem
[    4.543981] VFS: Mounted root (squashfs filesystem) readonly on device 254:0.
[    4.558734] Freeing unused kernel memory: 1188K
[    4.563414] This architecture does not have kernel memory protection.
[    4.570113] Run /sbin/init as init process
[    4.574342]   with arguments:
[    4.574347]     /sbin/init
[    4.574351]   with environment:
[    4.574356]     HOME=/
[    4.574360]     TERM=linux
[    5.449416] init: Console is alive
[    5.453469] init: - watchdog -
[    8.431547] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[    8.571227] install gl_hw_info
[    8.607630] usbcore: registered new interface driver usbfs
[    8.613370] usbcore: registered new interface driver hub
[    8.619011] usbcore: registered new device driver usb
[    8.674817] gl-tertf: (C) 2021 jianhui zhao <jianhui.zhao@gl-inet.com>
[    8.690246] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[    8.708223] SCSI subsystem initialized
[    8.719718] fsl-ehci: Freescale EHCI Host controller driver
[    8.729086] ehci-platform: EHCI generic platform driver
[    8.734897] ehci-platform 1b000000.usb: EHCI Host Controller
[    8.740860] ehci-platform 1b000000.usb: new USB bus registered, assigned bus number 1
[    8.749120] ehci-platform 1b000000.usb: irq 3, io mem 0x1b000000
[    8.777375] ehci-platform 1b000000.usb: USB 2.0 started, EHCI 1.00
[    8.784766] hub 1-0:1.0: USB hub found
[    8.789641] hub 1-0:1.0: 1 port detected
[    8.802799] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[    8.811267] ohci-platform: OHCI generic platform driver
[    8.821035] uhci_hcd: USB Universal Host Controller Interface driver
[    8.833803] usbcore: registered new interface driver usb-storage
[    8.841727] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[    8.849674] kmodloader: ["gl_system": "kernel_load"]
[    8.865376] init: - preinit -
[    9.377440] usb 1-1: new high-speed USB device number 2 using ehci-platform
[    9.625387] hub 1-1:1.0: USB hub found
[    9.631596] hub 1-1:1.0: 4 ports detected
[    9.907671] random: procd: uninitialized urandom read (4 bytes read)
[   10.097476] usb 1-1.1: new high-speed USB device number 3 using ehci-platform
[   10.278393] usb-storage 1-1.1:1.0: USB Mass Storage device detected
[   10.302501] scsi host0: usb-storage 1-1.1:1.0
[   10.608511] random: jshn: uninitialized urandom read (4 bytes read)
[   11.200695] random: jshn: uninitialized urandom read (4 bytes read)
[   11.225965] random: jshn: uninitialized urandom read (4 bytes read)
[   11.326103] random: jshn: uninitialized urandom read (4 bytes read)
[   11.379636] scsi 0:0:0:0: Direct-Access     Generic  STORAGE DEVICE   0233 PQ: 0 ANSI: 0
[   12.501559] sd 0:0:0:0: [sda] Attached SCSI removable disk
[   15.197358] usb 1-1.2: new high-speed USB device number 4 using ehci-platform
[   15.348238] usb 1-1.2: config 1 has an invalid interface number: 12 but max is 5
[   15.355903] usb 1-1.2: config 1 has no interface number 5
[   16.852269] mount_root: loading kmods from internal overlay
[   16.954188] kmodloader: loading kernel modules from //etc/modules-boot.d/*
[   16.977785] kmodloader: done loading kernel modules from //etc/modules-boot.d/*
[   16.985734] kmodloader: ["gl_system": "kernel_load"]
[   21.217895] UBIFS (ubi0:1): Mounting in unauthenticated mode
[   21.227933] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 520
[   21.391011] UBIFS (ubi0:1): recovery needed
[   21.698962] UBIFS (ubi0:1): recovery completed
[   21.703684] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "rootfs_data"
[   21.711815] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes
[   21.722063] UBIFS (ubi0:1): FS size: 106532864 bytes (101 MiB, 839 LEBs), journal size 5332992 bytes (5 MiB, 42 LEBs)
[   21.733025] UBIFS (ubi0:1): reserved for root: 4952683 bytes (4836 KiB)
[   21.739878] UBIFS (ubi0:1): media format: w5/r0 (latest is w5/r0), UUID E6CA6374-0B21-46B9-B70A-570C4C36AFB2, small LPT model
[   21.760342] block: attempting to load /tmp/ubifs_cfg/upper/etc/config/fstab
[   21.794481] block: extroot: not configured
[   21.799175] UBIFS (ubi0:1): un-mount UBI device 0
[   21.804088] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" stops
[   21.821199] UBIFS (ubi0:1): Mounting in unauthenticated mode
[   21.837436] UBIFS (ubi0:1): background thread "ubifs_bgt0_1" started, PID 523
[   22.224779] UBIFS (ubi0:1): UBIFS: mounted UBI device 0, volume 1, name "rootfs_data"
[   22.232936] UBIFS (ubi0:1): LEB size: 126976 bytes (124 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes
[   22.243183] UBIFS (ubi0:1): FS size: 106532864 bytes (101 MiB, 839 LEBs), journal size 5332992 bytes (5 MiB, 42 LEBs)
[   22.254145] UBIFS (ubi0:1): reserved for root: 4952683 bytes (4836 KiB)
[   22.260999] UBIFS (ubi0:1): media format: w5/r0 (latest is w5/r0), UUID E6CA6374-0B21-46B9-B70A-570C4C36AFB2, small LPT model
[   22.289620] mount_root: loading kmods from internal overlay
[   22.371695] kmodloader: loading kernel modules from /tmp/overlay/upper/etc/modules-boot.d/*
[   22.387647] kmodloader: done loading kernel modules from /tmp/overlay/upper/etc/modules-boot.d/*
[   22.397112] kmodloader: ["gl_system": "kernel_load"]
[   25.566375] block: attempting to load /tmp/ubifs_cfg/upper/etc/config/fstab
[   25.590388] block: extroot: not configured
[   25.602515] mount_root: switching to ubifs overlay
[   25.662434] urandom-seed: Seeding with /etc/urandom.seed
[   25.980284] procd: - early -
[   25.983706] procd: - watchdog -
[   26.960936] random: jshn: uninitialized urandom read (4 bytes read)
[   26.997716] procd: - watchdog -
[   27.023355] procd: - ubus -
[   27.547572] random: ubusd: uninitialized urandom read (4 bytes read)
[   27.556905] random: ubusd: uninitialized urandom read (4 bytes read)
[   27.598915] procd: - init -
[   28.481344] random: jshn: uninitialized urandom read (4 bytes read)
[   28.516817] random: ubusd: uninitialized urandom read (4 bytes read)
[   33.578972] mtdoops: ready 0, 1 (no erase)
[   33.578988] mtdoops: Attached to MTD device 6
[   34.976639] urngd: v1.0.2 started.
[   35.951166] kmodloader: loading kernel modules from /etc/modules.d/*
[   36.218562] random: crng init done
[   36.222097] random: 62 urandom warning(s) missed due to ratelimiting
[   37.544665] ntfs: driver 2.1.32 [Flags: R/O MODULE].
[   37.602211] tun: Universal TUN/TAP device driver, 1.6
[   38.580509] GACT probability on
[   38.589463] Mirror/redirect action on
[   38.626251] u32 classifier
[   38.629129]     input device check on
[   38.632904]     Actions configured
[   38.699461] fuse: init (API version 7.32)
[   38.766064] Bridge firewalling registered
[   38.781136] usbcore: registered new interface driver cdc_acm
[   38.786994] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
[   38.812564] usbcore: registered new interface driver cdc_wdm
[   38.828716] Loading modules backported from Linux version v5.15.92-0-ge515b9902f5f
[   38.836552] Backport generated by backports.git v5.15.92-1-0-gdfe0f60c
[   38.875778] usbcore: registered new interface driver ipheth
[   39.104922] usbcore: registered new interface driver usbserial_generic
[   39.111843] usbserial: USB Serial support registered for generic
[   39.153679] wireguard: WireGuard 1.0.20220627 loaded. See www.wireguard.com for information.
[   39.162481] wireguard: Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
[   39.331168] xt_time: kernel timezone is -0000
[   39.345952] usbcore: registered new interface driver cdc_ether
[   39.372985] usbcore: registered new interface driver cdc_ncm
[   39.490357] usbcore: registered new interface driver huawei_cdc_ncm
[   40.076655] PPP generic driver version 2.4.2
[   40.084442] NET: Registered protocol family 24
[   40.096038] qmi_wwan 1-1.2:1.4: cdc-wdm0: USB WDM device
[   40.106667] qmi_wwan 1-1.2:1.4: QuectelEC25&EC21&EG91&EG95&EG06&EP06&EM06&BG96&AG35 qmi wwan detected
[   40.117261] qmi_wwan 1-1.2:1.4 wwan0: register 'qmi_wwan' at usb-1b000000.usb-1.2, WWAN/QMI device, 76:af:f1:0b:cc:92
[   40.128606] usbcore: registered new interface driver qmi_wwan
[   40.171111] usbcore: registered new interface driver rndis_host
[   40.283392] ath10k_pci 0000:00:00.0: enabling device (0000 -> 0002)
[   40.292212] ath10k_pci 0000:00:00.0: pci irq legacy oper_irq_mode 1 irq_mode 0 reset_mode 0
[   55.354828] ath10k_pci 0000:00:00.0: qca9887 hw1.0 target 0x4100016d chip_id 0x004000ff sub 0000:0000
[   55.364449] ath10k_pci 0000:00:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 0
[   55.377432] ath10k_pci 0000:00:00.0: firmware ver 10.2.4-1.0-00047 api 5 features no-p2p,ignore-otp,skip-clock-init,mfp,allows-mesh-bcast crc32 62f7565f
[   56.155953] ath10k_pci 0000:00:00.0: board_file api 1 bmi_id N/A crc32 546cca0d
[   56.163930] ath10k_pci 0000:00:00.0: failed to read device EEPROM at 0000
[   56.170967] ath10k_pci 0000:00:00.0: failed to read calibration data from EEPROM: -22
[   57.333312] ath10k_pci 0000:00:00.0: htt-ver 2.1 wmi-op 5 htt-op 2 cal file max-sta 128 raw 0 hwcrypto 1
[   57.469070] ath: EEPROM regdomain: 0x0
[   57.469082] ath: EEPROM indicates default country code should be used
[   57.469087] ath: doing EEPROM country->regdmn map search
[   57.469100] ath: country maps to regdmn code: 0x3a
[   57.469107] ath: Country alpha2 being used: US
[   57.469112] ath: Regpair used: 0x3a
[   57.548960] usbcore: registered new interface driver option
[   57.554814] usbserial: USB Serial support registered for GSM modem (1-port)
[   57.562502] option 1-1.2:1.0: GSM modem (1-port) converter detected
[   57.569327] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB0
[   57.576701] option 1-1.2:1.1: GSM modem (1-port) converter detected
[   57.583536] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB1
[   57.590991] option 1-1.2:1.2: GSM modem (1-port) converter detected
[   57.597820] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB2
[   57.605197] option 1-1.2:1.3: GSM modem (1-port) converter detected
[   57.612055] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB3
[   57.754153] ath: EEPROM regdomain: 0x0
[   57.754170] ath: EEPROM indicates default country code should be used
[   57.754174] ath: doing EEPROM country->regdmn map search
[   57.754192] ath: country maps to regdmn code: 0x3a
[   57.754199] ath: Country alpha2 being used: US
[   57.754204] ath: Regpair used: 0x3a
[   57.766609] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
[   57.769097] ieee80211 phy1: Atheros AR9531 Rev:2 mem=0xb8100000, irq=13
[   57.808244] kmodloader: done loading kernel modules from /etc/modules.d/*
[   57.815652] kmodloader: ["gl_system": "kernel_load"]
[  109.069660] tertf: br-lan registered, add it
[  109.113094] br-lan: port 1(eth0) entered blocking state
[  109.113115] br-lan: port 1(eth0) entered disabled state
[  109.113491] device eth0 entered promiscuous mode
[  119.476870] br-lan: port 2(wlan0) entered blocking state
[  119.476890] br-lan: port 2(wlan0) entered disabled state
[  119.477294] device wlan0 entered promiscuous mode
[  128.617807] br-lan: port 2(wlan0) entered blocking state
[  128.617829] br-lan: port 2(wlan0) entered forwarding state
[  134.421152] 3g-modem_1_1_2: renamed from ppp0
[  397.445195] usb 1-1-port1: cannot reset (err = -71)
[  397.482239] usb 1-1-port1: cannot reset (err = -71)
[  397.516213] usb 1-1-port1: cannot reset (err = -71)
[  397.551190] usb 1-1-port1: cannot reset (err = -71)
[  397.585183] usb 1-1-port1: cannot reset (err = -71)
[  397.585206] usb 1-1-port1: Cannot enable. Maybe the USB cable is bad?
[  397.620218] usb 1-1-port1: cannot disable (err = -71)
[  397.654278] usb 1-1-port1: cannot reset (err = -71)
[  397.689154] usb 1-1-port1: cannot reset (err = -71)
[  397.721215] usb 1-1-port1: cannot reset (err = -71)
[  397.755243] usb 1-1-port1: cannot reset (err = -71)
[  397.791732] usb 1-1-port1: cannot reset (err = -71)
[  397.791751] usb 1-1-port1: Cannot enable. Maybe the USB cable is bad?
[  397.823342] usb 1-1-port1: cannot disable (err = -71)
[  397.858180] usb 1-1-port1: cannot reset (err = -71)
[  397.892198] usb 1-1-port1: cannot reset (err = -71)
[  397.926271] usb 1-1-port1: cannot reset (err = -71)
[  397.963135] usb 1-1-port1: cannot reset (err = -71)
[  398.000249] usb 1-1-port1: cannot reset (err = -71)
[  398.000272] usb 1-1-port1: Cannot enable. Maybe the USB cable is bad?
[  398.033242] usb 1-1-port1: cannot disable (err = -71)
[  398.068036] usb 1-1-port1: cannot reset (err = -71)
[  398.101190] usb 1-1-port1: cannot reset (err = -71)
[  398.134252] usb 1-1-port1: cannot reset (err = -71)
[  398.168192] usb 1-1-port1: cannot reset (err = -71)
[  398.203251] usb 1-1-port1: cannot reset (err = -71)
[  398.203275] usb 1-1-port1: Cannot enable. Maybe the USB cable is bad?
[  398.236180] usb 1-1-port1: cannot disable (err = -71)
[  398.270192] usb 1-1-port1: cannot disable (err = -71)
[  398.304350] hub 1-1:1.0: hub_ext_port_status failed (err = -71)
[  641.848221] usb 1-1.1: USB disconnect, device number 3
[  641.860022] usb 1-1.2: USB disconnect, device number 4
[  641.860372] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
[  641.860523] option 1-1.2:1.0: device disconnected
[  641.860952] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
[  641.861114] option 1-1.2:1.1: device disconnected
[  641.886679] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
[  641.886794] option 1-1.2:1.2: device disconnected
[  641.902777] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
[  641.902887] option 1-1.2:1.3: device disconnected
[  641.903169] qmi_wwan 1-1.2:1.4 wwan0: unregister 'qmi_wwan' usb-1b000000.usb-1.2, WWAN/QMI device
[  642.063447] usb 1-1: reset high-speed USB device number 2 using ehci-platform
[  642.603433] usb 1-1.1: new high-speed USB device number 5 using ehci-platform
[  642.765397] usb-storage 1-1.1:1.0: USB Mass Storage device detected
[  642.805390] scsi host0: usb-storage 1-1.1:1.0
[  642.903459] usb 1-1.2: new high-speed USB device number 6 using ehci-platform
[  643.055483] usb 1-1.2: config 1 has an invalid interface number: 12 but max is 5
[  643.055505] usb 1-1.2: config 1 has no interface number 5
[  643.074205] option 1-1.2:1.0: GSM modem (1-port) converter detected
[  643.074498] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB0
[  643.075112] option 1-1.2:1.1: GSM modem (1-port) converter detected
[  643.075376] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB1
[  643.076017] option 1-1.2:1.2: GSM modem (1-port) converter detected
[  643.076286] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB2
[  643.076932] option 1-1.2:1.3: GSM modem (1-port) converter detected
[  643.077216] usb 1-1.2: GSM modem (1-port) converter now attached to ttyUSB3
[  643.122165] qmi_wwan 1-1.2:1.4: cdc-wdm0: USB WDM device
[  643.122897] qmi_wwan 1-1.2:1.4: QuectelEC25&EC21&EG91&EG95&EG06&EP06&EM06&BG96&AG35 qmi wwan detected
[  643.124098] qmi_wwan 1-1.2:1.4 wwan0: register 'qmi_wwan' at usb-1b000000.usb-1.2, WWAN/QMI device, 76:af:f1:0b:cc:92
[  643.865187] scsi 0:0:0:0: Direct-Access     Generic  STORAGE DEVICE   0233 PQ: 0 ANSI: 0
[  644.986146] sd 0:0:0:0: [sda] Attached SCSI removable disk

Additional information:
Hostname: GL-E750
Model: GL.iNet GL-E750
Architecture: Qualcomm Atheros QCA9533 ver 2 rev 0
OpenWrt Version: OpenWrt 22.03.4 r20123-38ccc47687
Kernel Version: 5.10.176

Hello @BlaiseB ,

You can disable 2.4G wifi to see if it helps. If not working, please contact support@gl-inet.com for further assistance.

True, disabling 2.4Ghz wifi mitigates the issue, i also faced the same issue and still didnt find any solution.

Sorry this issue is related to the hardware. If issue persist after disabling 2.4GHz wifi, it's advised to contact GL.iNet customer service team for warranty.

No issue doesnt show up after disabling 2.4GHz wifi.

@Cathy Could you be a little more specific about this known problem? Perhaps there is a software solution that doesn’t require device replacement?

Why does the problem manifest on some but not all devices - if it is a hardware problem?

I have a client return that just arrived to me yesterday - Mudi with EM060KGL - and it has the same problem as described above. Disabling 2.4GHz won’t work because the client needs both bands.

Hi @EvolvePlease Yes, not all devices have this problem. It is related to hardware parameters, may be triggered in some users' usage scenarios. We are optimizing the hardware and sorry that it cannot be completely solved through the software solution at the moment.

@cathy

Which hardware parameters?

Which usage scenarios? So that I can advise my clients to avoid such a scenario.

Thank you very much for your replies! I'll try switching to 5GHz wifi and see if the issue persists. If yes, I'll email the customer service for warranty.

We noticed that using 2.4G wifi or in the case of heavy traffic transfer, may cause this modem issue. So disabling 2.4G wifi can alleviate the issue.
In addition, some disconnections may look the same, they may occur for different reasons. It's advised to send router logs to GL.iNet support for analysis. Thanks

@Cathy It is not as easy as simply dismissing these problems with incomplete answers. They must be addressed, clearly and resolutely.

Is it correct that:

  1. Using 2.4GHz band may cause the problem.

  2. “Heavy” traffic (regardless of band) may cause the problem.

  3. Disabling 2.4GHz band can (but might not) alleviate the issue AFTER it is present.

And:

Is this a new problem that impacts only the current firmware? Or does it impact all firmware versions?

  1. Using 2.4GHz band may cause the problem. --Yes
  2. “Heavy” traffic (regardless of band) may cause the problem. --Yes
  3. Disabling 2.4GHz band can (but might not) alleviate the issue AFTER it is present.--Yes

Impact all firmware version. The issue currently only affects the E750V2C6 model.

Users who have this problem can contact support@gl-inet.com for further support

@Cathy thank you.

Does the fatal problem occur only while using 2.4GHz WiFi band while connected to cellular network?

Or - does it also occur if Mudi is connected to public network via WiFi repeater or Ethernet cable?

Also:

If a device is affected, is the problem resolved by replacing the modem with a new EM060KGL modem? And disabling 2.4GHz WiFi, of course.

Do you know if the problem can happen on a device that is using the EM12G modem?

This problem is related to the modem, so only occurs while using cellular internet.

Actually we don't suggest user to replace modem themselves. The parameters of each module may be different, and replacing the module directly may introduce other problems

@Cathy

I don’t suggest selling defective devices. But you sell them anyway, so let me rephrase the same questions:

If a device is affected, is the problem resolved by replacing the modem with a new EM060KGL modem of the same characteristics as the OEM modem? And also disabling 2.4GHz WiFi, of course, to avoid killing another modem.

Do you know if the problem can happen on a device that is using the EM12G modem?

Background: the importance and relevance of my questions are founded on the basis that I have clients with these devices. Their devices are already in the field, and some of the devices already have failed. I am exploring how to deal with the fallout. Sending an email to support is not a realistic solution.

Hi, if you have a batch device, please provide your information and contact support@gl-inet.com for a better solution. thank you