Not quite sure what’s happening with my Sonos Surround Set (Arc plus two Sonos Ones). 

It was working fine. Then, last night, it has stopped working properly. What I mean by that is, on the “Audio Output” screen of Apple TV’s Settings, the Default Audio Output is “Receiver Speakers” - and there’s no other option. 

I can select “Living Room Cinema” (What my Sonos Set is called) but only on “Temporary Audio Output”. Even then, it doesn’t work properly. 

My surround sound isn’t coming on. Speakers are fine (they’ll play music, as normal) but I can’t seem to find the issue. 

Also, when I go into the options for Temporary Audio Output, it has a U2 song at the top! No idea why. 

Can someone point me in the right direction?