Have you tried directly streaming from the Spotify app using Spotify Connect?

This certainly seems contrary to the way Sonos is supposed to work. Have you submitted a system diagnostic within 10 minutes of experiencing this problem, and called Sonos Support to discuss it? 

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.

Thanks Bruce,

Didnt get a diagnostics last night as we were cooking dinner.  Tried Spotify on Sonos this morning and it played well with the offending speaker.  Then the missus arrived back from her class complaining that Spotify wasn’t working?  So maybe we can put last nights episode down to Spotify, even though I was using her phone to play Sonos.  Doesn’t explain why it played on Playbar and not on Play3’s?

If only Sonos can improve the App and speed up response times!

Thanks Bruce.

Sonos has never said, I think, how much/how long they store diagnostic data in your system to include in what they send to their servers for storage, logic suggests it isn’t infinite. Most Sonos forum moderators suggest that ten minute window to submit data, that makes some sense to me. But I suppose some data streams may have longer ‘saving’ times, I don’t know. But certainly that data can’t be infinite, both for storage and transmission reasons. 

Hopefully, you’ll be able to catch the next occurrence within that 10 minute window, and submit it, and then call in at your leisure. Once the data is stored, I’d imagine it’s on their servers for a long time before getting deleted. I’ve never seen a case where someone called in at a later time and the data wasn’t accessible.