Wireguard disconnects after several minutes

I’ve been using wireguard client on the GLB-B1300 without issues for nearly a year but suddenly it stopped working. No settings were changed.

The VPN I use is Mullvad. I tried purging all profiles and re adding using the automatic method and directly inputting the configuration.

The connection works but only for a few minutes. I’ve tried resetting to factory but every time it drops after 2-3 minutes

OpenVPN works using mullvad. Only wireguard is having issues

Can you provide some system logs?
You can find it in MORE SETTINGS->Advanced->status->system log