That certainly seems troublesome. Have you also updated the TV? Sonos does require a connection via HDMI-CEC (ARC) to exist, it sounds like your process is constantly re-establishing this. I wouldn’t hope it has anything whatsoever to do with WiFi, since the data doesn’t come in from the TV that way. I might also reset the connection of the HDMI cable, by rewearing it (pull it out at both ends, then reinsert it).

But if that doesn’t achieve the desired goal, I’d recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here, they get sensitive about GDPR.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

Thanks

ive changed network channels in sonosnet after advice from Sonos “bot” chat. Will see if this does anything positive. Have tried updating network but I just get a “somethings wrong” message in the app. 
 

if/when sound drops off and system disappears from app I will submit diagnostics and give them a call 👍