No, none here, on two different Arcs. I have to wonder if it is the TV sending fluctuating volume messages to the Arc, rather than a malfunction in the Arc, but both are certainly feasible. I’d probably reboot both of them by unplugging them from the wall for two minutes (each of them, starting with the TV set). Once they’ve both come back up, I’d check for updates, for both. There could be an update waiting for the TV’s OS that fixes this issue, there certainly was an update ‘this morning’ for the Sonos.
If that doesn’t fix the issue, I’d 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, their lawyers 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.
