It has never occurred for me, in the several years I’ve been using a Sonos Roam. Makes me wonder if it is a local issue. Have you submitted a system diagnostic within 10 minutes of experiencing this problem, and called Sonos Support to discuss it?

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.

The issue is rare but the number of times it has occurred to other customers who have complained here tells me it is not "local". When I interacted with Sonos support when it happened the first time I submitted a diagnostics and was told to reset the unit. It had not recurred for 2 years. I assumed - silly me - that Sonos had addressed the issue as part of one of the many updates to support new products. Evidently not.

Equally evidently they never used any units that were returned as a result of customers experiencing this to duplicate the issue, never used those submitted diagnostics to find anything in common between the units that exhibited it, or otherwise tested similar components to find a solution. That in the almost three years it has been occurring. Sonos relies on the rarity of customers having their ear drums assaulted - it is, as others have described, a horribly loud noise - to ignore the issue. As with the app failures it is just more “we are Sonos and we don’t have to care; we have new products to sell.”