Have the same issue on my devices when connected to WiFi on MT1300. Running latest firmware.

I also have a LOT of DHCP requests that keep showing up in the logs, just like @alistair23

They are from Windows 10 computers. My only workaround was to set static IP on both my windows machines. I do not have this issue on any other router so there is some odd interaction between MT1300 and Windows 10. Not sure this will address the WiFi disconnect issue, but will re-post if reducing the DHCP requests has any effect.

Either way, GL should look into why Windows 10 causes so many DHCP requests. It looks like every 45 seconds the Windows 10 machine calls for new DHCP:

Wed Oct 27 12:31:29 2021 daemon.info dnsmasq-dhcp[2880]: DHCPACK(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d ASUS
Wed Oct 27 12:32:16 2021 daemon.info dnsmasq-dhcp[2880]: DHCPREQUEST(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d
Wed Oct 27 12:32:16 2021 daemon.info dnsmasq-dhcp[2880]: DHCPACK(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d ASUS
Wed Oct 27 12:32:59 2021 daemon.info dnsmasq-dhcp[2880]: DHCPREQUEST(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d
Wed Oct 27 12:32:59 2021 daemon.info dnsmasq-dhcp[2880]: DHCPACK(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d ASUS
Wed Oct 27 12:33:45 2021 daemon.info dnsmasq-dhcp[2880]: DHCPREQUEST(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d
Wed Oct 27 12:33:45 2021 daemon.info dnsmasq-dhcp[2880]: DHCPACK(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d ASUS
Wed Oct 27 12:34:30 2021 daemon.info dnsmasq-dhcp[2880]: DHCPREQUEST(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d
Wed Oct 27 12:34:30 2021 daemon.info dnsmasq-dhcp[2880]: DHCPACK(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d ASUS
Wed Oct 27 12:35:15 2021 daemon.info dnsmasq-dhcp[2880]: DHCPREQUEST(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d
Wed Oct 27 12:35:15 2021 daemon.info dnsmasq-dhcp[2880]: DHCPACK(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d ASUS
Wed Oct 27 12:36:00 2021 daemon.info dnsmasq-dhcp[2880]: DHCPREQUEST(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d
Wed Oct 27 12:36:00 2021 daemon.info dnsmasq-dhcp[2880]: DHCPACK(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d ASUS
Wed Oct 27 12:36:46 2021 daemon.info dnsmasq-dhcp[2880]: DHCPREQUEST(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d
Wed Oct 27 12:36:46 2021 daemon.info dnsmasq-dhcp[2880]: DHCPACK(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d ASUS
Wed Oct 27 12:37:32 2021 daemon.info dnsmasq-dhcp[2880]: DHCPREQUEST(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d
Wed Oct 27 12:37:32 2021 daemon.info dnsmasq-dhcp[2880]: DHCPACK(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d ASUS
Wed Oct 27 12:38:15 2021 daemon.info dnsmasq-dhcp[2880]: DHCPRELEASE(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d
Wed Oct 27 12:38:19 2021 daemon.info dnsmasq-dhcp[2880]: DHCPDISCOVER(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d
Wed Oct 27 12:38:19 2021 daemon.info dnsmasq-dhcp[2880]: DHCPOFFER(br-lan) 192.168.8.181 98:2c:bc:d4:b8:1d