I have the same problem. I see it has been reported before more than two years ago and some other times all of a sudden the Sonos roam starts making a loud sizzling banging noise almost like an alarm going off. only way to stop it is to open the Sonos app??? What is it? And how can I prevent this from happening?
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I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. But 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.
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