Hi @ChromeDome.
Thanks for reaching out and for your detailed post, let me help and try to figure this out.
Have you tried to change the audio format on the TV, if it is outputting PCM, try to set it to Dolby?
Kindly submit a diagnostic report through the Sonos app when the issue occurs, and reply with the confirmation number. I'd start by reviewing your system, it will help in identifying what's possibly causing the issue.
I’m looking forward to assisting you further from here.
If you have any other questions or run into any issues, please do not hesitate to reach out, we are always here to help.
Help others find useful content by clicking the like button and selecting the best answer to your question