I’ve found another thread with the exact same problem here - https://forum.gl-internet.com/t/mt1300-connection-issues-wan-wifi-connected-but-no-internet/17412?u=glwoes

Below are some of the logs generated when the light changes from white to blue with slow blink. My WiFi stays connected, but there’s no internet. The tether to the phone is also up and from the phone I have internet connectivity. The router cycles from being connected to disconnected.

Sat Jan 29 18:40:06 2022 kern.warn kernel: [43364.080877] 849, flush one!

Sat Jan 29 18:41:22 2022 kern.warn kernel: [43439.987797] 8f7, flush one!

Sat Jan 29 18:45:43 2022 user.info mwan3rtmon[3110]: Detect rtchange event.

Sat Jan 29 18:45:44 2022 user.notice firewall: Reloading firewall due to ifup of tethering (eth1)

Sat Jan 29 18:46:41 2022 kern.warn kernel: [43758.934536] ba0, flush one!

Sat Jan 29 18:51:45 2022 user.info mwan3rtmon[3110]: Detect rtchange event.

Sat Jan 29 18:51:45 2022 user.notice firewall: Reloading firewall due to ifup of tethering (eth1)

Sat Jan 29 18:52:49 2022 kern.warn kernel: [44126.737000] d4d, flush one!

Sat Jan 29 18:54:53 2022 kern.warn kernel: [44250.539580] de2, flush one!

Sat Jan 29 18:57:51 2022 user.info mwan3rtmon[3110]: Detect rtchange event.

Sat Jan 29 18:57:51 2022 user.notice firewall: Reloading firewall due to ifup of tethering (eth1)

Any help would be appreciated. Are others having this problem?