This might be a bit complicated both because of my limited tech knowledge as well as the nature of the problem. I have multiple Sonos devices throughout my house with several tv soundbars, a play one in the bathroom, a playbase in living room, and several connect:amps running speakers in garage and patio. One of the TVs has a beam on it (guest room). Downstairs is my main tv, receiver (Sony STR-ZA3100ES), and also tied into Sonos System via another connect:amp.
It’s all great except for one glitch. Whenever the guest room is running anything, either tv or music, the receiver downstairs switches to the music input and any attempt to switch to another source will either cause it to switch back or shut off. So, effectively, if someone is using guest room Sonos, you cannot watch tv downstairs. Shut down guest room and everything else works fine.
Sonos problem, Sony problem, what?