Seems odd, certainly. Makes me wonder about possible IP address issues with your local library device, and not your speakers themselves.
Try powering down this device, then reboot your router. Give the router a couple of minutes to recover, then plug back in your local library device. Give it a couple of minutes to come back up, then test.
However, if this doesn’t resolve the issue, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it. But 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.