I have been facing the following problem since many months now and none of the solutions seems to work.
My set up is Playbar connected to LG smart TV via Optical cable, 2 Play 1s and a Sub. Tv is connected via Wifi, Sonos Playbar is hard wired to the router.
The problem of sound not coming at all happens a lot of times but following are some of the instances I have noticed it over and over again.
When starting a video on youtube app on tv,
Also again when a new video starts
Also while switching apps on tv like to Netflix I loose the sound.
To get back the sound I go to Sonos app and select a song (while the video on tv is still playing with no sound) and the sound comes back.
Please help to resolve this?