R8000P and Wifi Issues

I have a r8000p that I sit behind my virgin media router - that is now in modem mode. The r8000p is wires to the modem and was working fine but last night the internet light turned orange and I am unable to connect via WiFi. I have checked the Modem do that is connected to the internet working fine. Does anyone know what I need to do to have WiFi working again.? I’ve tried resetting r8000p and it still doesn’t work.

I am not an in-depth techno person but whatvi thought was a good understanding of things like this but I am stumped and don’t know why to do - if any one can offer a solutio. it would be much appreciated.

Thanks.