Sonos shows you whatever data it receives from Spotify (or any streaming company) in the order it receives it. Sonos doesn’t do any sorting or filtering. Some people seem to want Sonos to filter it.
In any case, I suspect there is some sort of wifi interference between your speakers and the Spotify server that is sending you the data. Unfortunately, I don’t have enough data to determine if this is local to you, or outside your home.
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.