Honestly, I’d try a power down reboot of all devices….the Sonos, the router, and the iOS devices. If that didn’t fix it, I’d start looking for potential sources of wifi interference , although that has a much less chance of being the issue here.
At the end of the day, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. With the caveat, of course, that as you’re trying to use AirPlay 2, there’s much less of the signal path involved in the Sonos world, so what they’ll be able to ‘see’ will be substantially less.
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 phone folks, they have tools at their disposal that will allow them to give you advice specific to your Sonos system and network.
Thank you for your tips Bruce.
Setting routers 2,4GHz channel to 6 (instead “Auto”) seems to have solved the issue. I will monitor this for few more days.
Mike
Having Sonos (and AirPlay 2) constantly chasing the “latest” wifi channel is never good. :)