Opal (GL-SFT1200) Keeps Disconnecting from the Main Router


I use Opal (GL-SFT1200) running firmware V 3.212.
I am connected the main router through Cable and Wifi
This device keeps disconnecting from the Main Router after around 6 to 10 Hrs.
The device is working as a Wireguard VPN client
I am forced to restart the device everyday to reconnect

To resolve the issue I have tried the following but was not successful
I have reset the device multiple times,
tried connecting to the main router using only the cable and later only through wifi.

However I have GL-MT1300 also connected to the main router and have no issue with that device.

I am not sure how to address the issue

Can you get the system log after this happens?