PVR Issues

All of a sudden I am getting a message saying "PVR not connected to the network".

I cannot see any past recordings, make a new recording etc.

Rest of the Optix TV box is working without any issues.

Any ideas how I can resolve this?

I have gone through all the steps such as rebooting modem, TV box etc a number of times. I have checked all the connections at the back of the box and elsewhere.

Thanks.