Hi @jheylin.

Welcome to the Sonos community and thanks for reaching out to us. Allow me to help out by sharing some information and asking questions.

1. Do we have the same behavior when listening to music?
2. What is the video source? regular cable, TV in-apps, cable box, ETC?
3. Was there any noticeable changes that happened prior it was still working and the moment it stopped working?
4. Can we try to submit a diagnostic after 3-5 minutes after the issue re-occured?
5. Can we check the TV audio quality and make sure it is set to PCM and check if the issue still persists and not DTS as DTS is not a supported audio format for home theater as discussed in this FAQ?
6. Can we check the TV audio quality through the TV menu and set it to 5.1 surrounds if it is available and observe if the issue persists?
7. Can we try to unplug all Sonos devices from power and then plug them back into power after 10-15 seconds (starting with the Sonos product connected to the TV) and observe if the issue persists?
8. Do we have the same behavior when we use other video/movie source such as TV in-apps, regular cable TV, cable BOX (if applicable), 
9. Can we also try to submit a diagnostic at each try of different movie source and music to check if issue is present regardless of what we are playing?

Is this a hardware issue? We cannot conclude yet until we can prove it is a hardware issue. It may just be an unsupported audio format set up on the TV menu. 

The more information you provide, the more we can better understand what is going on to help you out.

Thanks,