Thanks @jeffsf for suggesting where to look. There are a lot of entities in my config, so the ‘logs’ below are somewhat long. I am not using the WAN ports as I only have a single ethernet running into my main switch, therefore they are fine to not be up.
cat /etc/config/wireless
config wifi-device 'wifi0'
option type 'qcawifi'
option macaddr 'my:ma:ca:dd:rs:84'
option hwmode '11g'
option country 'GB'
option channel 'auto'
option txpower '20'
config wifi-iface
option device 'wifi0'
option network 'lan'
option mode 'ap'
option blockdfschan '1'
option ifname 'ath0'
option encryption 'psk2+tkip+ccmp'
option key 'mypsk1'
option ssid 'ssid1'
config wifi-device 'wifi1'
option type 'qcawifi'
option channel 'auto'
option macaddr 'my:ma:ca:dd:rs:85'
option htmode 'VHT20'
option txpower '23'
option country 'GB'
option hwmode '11ac'
config wifi-iface
option device 'wifi1'
option network 'lan'
option mode 'ap'
option blockdfschan '1'
option ifname 'ath1'
option encryption 'psk2+tkip+ccmp'
option key 'mypsk1'
option ssid 'ssid1'
config wifi-iface 'wif120r0'
option network 'ifvlan120'
option mode 'ap'
option ssid 'ssid120'
option encryption 'psk2+ccmp'
option key 'psk120'
option device 'wifi0'
config wifi-iface 'wif120r1'
option device 'wifi1'
option network 'ifvlan120'
option mode 'ap'
option ssid 'ssid120'
option encryption 'psk2+ccmp'
option key 'ssid120'
config wifi-iface 'wif80r1'
option device 'wifi1'
option network 'ifvlan80'
option mode 'ap'
option ssid 'ssid80'
option encryption 'psk2+ccmp'
option key 'psk80'
config wifi-iface 'wif150r1'
option device 'wifi1'
option network 'ifvlan150'
option mode 'ap'
option ssid 'ssid150'
option key 'psk150'
option encryption 'psk2+tkip+ccmp'
config wifi-iface 'wif80r0'
option device 'wifi0'
option network 'ifvlan80'
option mode 'ap'
option ssid 'ssid80'
option encryption 'psk2+ccmp'
option key 'psk80'
config wifi-iface 'wif150r0'
option device 'wifi0'
option network 'ifvlan150'
option mode 'ap'
option ssid 'ssid150'
option key 'psk150'
option encryption 'psk2+tkip+ccmp'
cat /etc/config/network
config interface 'loopback'
option ifname 'lo'
option proto 'static'
option ipaddr '127.0.0.1'
option netmask '255.0.0.0'
config globals 'globals'
option ula_prefix 'auto'
config interface 'lan'
option ifname 'eth1'
option type 'bridge'
option _orig_ifname 'eth1 ath0 ath1'
option _orig_bridge 'true'
option proto 'dhcp'
option hostname 'glinet-WLAN-AP3'
option ieee1905managed '1'
config interface 'wan'
option ifname 'eth0'
option proto 'dhcp'
option hostname 'GL-B1300-123-5G'
config interface 'wan6'
option ifname 'eth0'
option proto 'dhcpv6'
config switch
option name 'switch0'
option reset '1'
option enable_vlan '1'
config switch_vlan
option device 'switch0'
option vlan '1'
option ports '0t 1 2 3 4'
config switch_vlan
option device 'switch0'
option vlan '2'
option ports '0t 5'
config switch_ext
option device 'switch0'
option name 'QosPtMode'
option port_id '1'
option mode 'dscp'
option status 'enable'
config switch_ext
option device 'switch0'
option name 'QosPtMode'
option port_id '2'
option mode 'dscp'
option status 'enable'
config switch_ext
option device 'switch0'
option name 'QosPtMode'
option port_id '3'
option mode 'dscp'
option status 'enable'
config switch_ext
option device 'switch0'
option name 'QosPtMode'
option port_id '4'
option mode 'dscp'
option status 'enable'
config switch_ext
option device 'switch0'
option name 'QosPtMode'
option port_id '5'
option mode 'dscp'
option status 'enable'
config switch_vlan 'swvlan120'
option vlan '120'
option vid '120'
option ports '0t 3t 4t 5t'
option device 'switch0'
config switch_vlan 'swvlan80'
option vlan '80'
option vid '80'
option ports '0t 3t 4t 5t'
option device 'switch0'
config switch_vlan 'swvlan150'
option vlan '150'
option vid '150'
option ports '0t 3t 4t 5t'
option device 'switch0'
config switch_vlan 'swvlan90'
option vlan '90'
option vid '90'
option ports '0t 3t 4t 5t'
option device 'switch0'
config interface 'ifvlan120'
option proto 'dhcp'
option type 'bridge'
option ifname 'eth1.120'
config interface 'ifvlan80'
option proto 'dhcp'
option type 'bridge'
option ifname 'eth1.80'
config interface 'ifvlan150'
option proto 'dhcp'
option type 'bridge'
option ifname 'eth1.150'
config interface 'ifvlan90'
option proto 'dhcp'
option type 'bridge'
option ifname 'eth1.90'
ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: miireg: <> mtu 0 qdisc noop state DOWN mode DEFAULT group default
link/generic
3: ifb0: <BROADCAST,NOARP> mtu 1500 qdisc hyfi_pfifo_fast state DOWN mode DEFAULT group default qlen 32
link/ether nw:ma:ca:dd:rs:db brd ff:ff:ff:ff:ff:ff
4: ifb1: <BROADCAST,NOARP> mtu 1500 qdisc hyfi_pfifo_fast state DOWN mode DEFAULT group default qlen 32
link/ether ab:ma:ca:dd:rs:04 brd ff:ff:ff:ff:ff:ff
5: gre0@NONE: <NOARP> mtu 1476 qdisc noop state DOWN mode DEFAULT group default
link/gre 0.0.0.0 brd 0.0.0.0
6: gretap0@NONE: <BROADCAST,MULTICAST> mtu 1462 qdisc hyfi_pfifo_fast state DOWN mode DEFAULT group default qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
7: bond0: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN mode DEFAULT group default
link/ether cd:ma:ca:dd:rs:92 brd ff:ff:ff:ff:ff:ff
8: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc hyfi_pfifo_fast state DOWN mode DEFAULT group default qlen 1000
link/ether my:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
9: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc hyfi_pfifo_fast master br-lan state UP mode DEFAULT group default qlen 1000
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
10: wifi0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN mode DEFAULT group default qlen 2699
link/ieee802.11 my:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
11: wifi1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN mode DEFAULT group default qlen 2699
link/ieee802.11 my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
12: br-ifvlan120: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
13: eth1.120@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan120 state UP mode DEFAULT group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
16: br-ifvlan80: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
17: eth1.80@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan80 state UP mode DEFAULT group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
18: br-ifvlan90: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
19: eth1.90@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan90 state UP mode DEFAULT group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
20: br-lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
29: ath0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-lan state UNKNOWN mode DEFAULT group default
link/ether my:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
30: ath01: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan120 state UNKNOWN mode DEFAULT group default
link/ether ot:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
31: ath02: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan80 state UNKNOWN mode DEFAULT group default
link/ether yr:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
32: ath03: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan150 state UNKNOWN mode DEFAULT group default
link/ether hd:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
33: ath1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-lan state UNKNOWN mode DEFAULT group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
34: ath11: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan120 state UNKNOWN mode DEFAULT group default
link/ether ot:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
35: ath12: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan80 state UNKNOWN mode DEFAULT group default
link/ether yr:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
36: ath13: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan150 state UNKNOWN mode DEFAULT group default
link/ether hd:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
37: br-ifvlan150: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
38: eth1.150@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan150 state UP mode DEFAULT group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: miireg: <> mtu 0 qdisc noop state DOWN group default
link/generic
3: ifb0: <BROADCAST,NOARP> mtu 1500 qdisc hyfi_pfifo_fast state DOWN group default qlen 32
link/ether nw:ma:ca:dd:rs:db brd ff:ff:ff:ff:ff:ff
4: ifb1: <BROADCAST,NOARP> mtu 1500 qdisc hyfi_pfifo_fast state DOWN group default qlen 32
link/ether ab:ma:ca:dd:rs:04 brd ff:ff:ff:ff:ff:ff
5: gre0@NONE: <NOARP> mtu 1476 qdisc noop state DOWN group default
link/gre 0.0.0.0 brd 0.0.0.0
6: gretap0@NONE: <BROADCAST,MULTICAST> mtu 1462 qdisc hyfi_pfifo_fast state DOWN group default qlen 1000
link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
7: bond0: <BROADCAST,MULTICAST,MASTER> mtu 1500 qdisc noop state DOWN group default
link/ether cd:ma:ca:dd:rs:92 brd ff:ff:ff:ff:ff:ff
8: eth0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc hyfi_pfifo_fast state DOWN group default qlen 1000
link/ether my:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
inet6 fe80::e695:5678:9012:c184/64 scope link
valid_lft forever preferred_lft forever
9: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc hyfi_pfifo_fast master br-lan state UP group default qlen 1000
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
inet6 fe80::e695:5678:9012:c185/64 scope link
valid_lft forever preferred_lft forever
10: wifi0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 2699
link/ieee802.11 my:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
11: wifi1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 2699
link/ieee802.11 my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
12: br-ifvlan120: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
inet 192.168.120.3/24 brd 192.168.120.255 scope global br-ifvlan120
valid_lft forever preferred_lft forever
inet6 fe80::e695:5678:9012:c185/64 scope link
valid_lft forever preferred_lft forever
13: eth1.120@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan120 state UP group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
16: br-ifvlan80: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
inet 192.168.80.3/24 brd 192.168.80.255 scope global br-ifvlan80
valid_lft forever preferred_lft forever
inet6 fe80::e695:5678:9012:c185/64 scope link
valid_lft forever preferred_lft forever
17: eth1.80@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan80 state UP group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
18: br-ifvlan90: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
inet 192.168.90.2/24 brd 192.168.90.255 scope global br-ifvlan90
valid_lft forever preferred_lft forever
inet6 fe80::e695:5678:9012:c185/64 scope link
valid_lft forever preferred_lft forever
19: eth1.90@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan90 state UP group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
20: br-lan: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
inet 192.168.8.247/24 brd 192.168.8.255 scope global br-lan
valid_lft forever preferred_lft forever
inet6 fe80::e695:5678:9012:c185/64 scope link
valid_lft forever preferred_lft forever
29: ath0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-lan state UNKNOWN group default
link/ether my:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
inet6 fe80::e695:5678:9012:c184/64 scope link
valid_lft forever preferred_lft forever
30: ath01: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan120 state UNKNOWN group default
link/ether ot:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
inet6 fe80::1234:5678:9012:c184/64 scope link
valid_lft forever preferred_lft forever
31: ath02: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan80 state UNKNOWN group default
link/ether yr:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
inet6 fe80::ec95:5678:9012:c184/64 scope link
valid_lft forever preferred_lft forever
32: ath03: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan150 state UNKNOWN group default
link/ether hd:ma:ca:dd:rs:84 brd ff:ff:ff:ff:ff:ff
inet6 fe80::f095:5678:9012:c184/64 scope link
valid_lft forever preferred_lft forever
33: ath1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-lan state UNKNOWN group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
inet6 fe80::e695:5678:9012:c185/64 scope link
valid_lft forever preferred_lft forever
34: ath11: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan120 state UNKNOWN group default
link/ether ot:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
inet6 fe80::1234:5678:9012:c185/64 scope link
valid_lft forever preferred_lft forever
35: ath12: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan80 state UNKNOWN group default
link/ether yr:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
inet6 fe80::ec95:5678:9012:c185/64 scope link
valid_lft forever preferred_lft forever
36: ath13: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan150 state UNKNOWN group default
link/ether hd:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
inet6 fe80::f095:5678:9012:c185/64 scope link
valid_lft forever preferred_lft forever
37: br-ifvlan150: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
inet6 fe80::e695:5678:9012:c185/64 scope link
valid_lft forever preferred_lft forever
38: eth1.150@eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue master br-ifvlan150 state UP group default
link/ether my:ma:ca:dd:rs:85 brd ff:ff:ff:ff:ff:ff
brctl show
bridge name bridge id STP enabled interfaces
br-ifvlan120 7fff.e4956e44c185 no ath01
ath11
eth1.120
br-ifvlan150 7fff.e4956e44c185 no ath03
ath13
eth1.150
br-ifvlan80 7fff.e4956e44c185 no ath02
ath12
eth1.80
br-ifvlan90 7fff.e4956e44c185 no eth1.90
br-lan 7fff.e4956e44c185 no ath0
ath1
eth1