Thanks for posting on the community and I am sorry that you're having some issues with your set top box.
Do you have another V6s/Tivos in the home that are also having the same problem?
Can you please try going to Home > Help & Settings > Settings > Network > Connect to the Virgin Media service now. Once that's completed, I'd recommend turning the set top box on and off at the mains socket, and seeing if they apps come back.
The error count on our side are just indications of some faults that can sometimes cause issues with the functionality of the box.
I can look into appointments for next week if that's preferable for you, I just want to double check first if you have tried using your V6 over WiFi rather than connected to the internet via Ethernet cable? Also, were you advised if you would get called in 72 hours or whether it would be resolved then?
So to connect via WiFi, you would need to unplug the Ethernet cable out of the back of the V6, then head over to the Network section of your settings and an option should then be available to connect via WiFi.