I have four Sonos Connect Amps that drive six different rooms. Four rooms are just speakers for music and two rooms are for TV sound and music. Those two rooms show up in Sonos as Line In. I lose sound for TV in those rooms often and the switching back and forth between music and TV does not work well. Right now I’ve completely lost TV audio on one room and have rebooted Sonos, updated the app, toggled between TV and music in Sonos, etc.