Samsung qe55q80cat. System on Sonos up-to-date. Tv brand new and updated after installation.
Found this dated a month ago:
There was a similar issue recently whereby Beams would have no audio when playing TV audio coming from certain Samsung TVs, which has now been resolved. As your TV and Beam seem to be losing the connection between them, however, this seems like a different issue. I recommend you get in touch with our technical support team who have tools at their disposal that will allow them to give you advice specific to your Sonos system and what it reports.
Sounds like our problem too, same TV. Will try technical support. Unless any updated information from other users. Thanks