That suggests some network instability, with likely the speakers not maintaining a great connection to your router, and through that, to your controller. I’d start with a simple network refresh. Unplug all your Sonos devices from power, then reboot your router. Give the router a couple of minutes before plugging back in your Sonos. Give them a couple of minutes to connect, and just for safety, check for updates, as there was a rolling update out this week. Then test.
If the experience continues, I would recommend that you 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, 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.