I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call 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 phone folks, they have tools at their disposal that will allow them to give you advice specific to your Sonos system and network.

Thanks. But am I the only one with this issue?

How do I submit a system diagnostic?

On the App go to the system icon, bottom right.  Then click on support and the submit diagnostic is there.

No this is not a common issue.

I have now submitted my diagnostics report. What happens now?

Contact/chat to Sonos Support Staff (when available) via this LINK

Might be worth reading the Diagnostics - How do they work? thread, too.