However, there’s some possibility that the implementation of AirPlay 2 given to the Windows machines for connection has issues, based on the threads in this forum. If the previous suggestion I made doesn’t clear the issue, I’d certainly submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. Don’t post the resulting diagnostic number here, Sonos’ lawyers get sensitive about GDPR, I suspect.
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.