Repeater loses internet connection when WG server enabled

I have a few devices setup in different locations, however this is the first device setup as a Repeater and not by Ethernet.

The Router is connected to the main router over WiFi (Repeater mode).

  • everything works fine, PC connected through Ethernet good signal and speeds.

When enabling WireGuard, I’m able to connect to the router and have internet access for a couple of seconds then no internet, when looking at the admin web panel it says connected but no internet connection.

Once I disable WireGuard server the internet reconnects within a minute.

My question is, am I able to use a repeater mode router as a VPN Server or does it have to be connected through Ethernet .

What is the router model, firmware version?

Pls post logs when this problem happens.