Check for updates again. Have you rebooted the PLAY:1’s? Sometimes resetting the controller will cure oddities.
If you experience the issue again, immediately submit a diagnostic. Sonos support can access the diagnostic. Log the diagnostic number, but don’t post it here.
Don’t Factory Reset without further consult.
I forgot to mention, I updated on Friday. Tried rebootiing the Play:1s many times. It certainly hasn’t fixed the source of this recurring problem...
Check for updates again. Occasionally, a unit or two may not update with the other units.
While it will destroy diagnostic data, you can Factory Reset (only) the Kitchen units. As you reinstall the units take care to add them to your system, don’t setup a new system.