Iāve certainly never seen Sonos to behave in this way. I think the next time it happens, you should submit a system diagnostic within 10 minutes, and call Sonos Support to discuss it. Donāt 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.