Hi @jhedwards 

Welcome to the Sonos Community!

There is a limit on how many tracks Sonos will load from one Spotify playlist, but it is well over 6000, so you’re not hitting a ceiling here.

There could be an issue with how long the playlist takes to load, however, or transmission errors during the loading of the playlist.

I recommend you remove power from your Sonos devices and your WiFi router. Once the router has been off for at least 30 seconds, turn it on and wait 3-5 minutes for WiFi to return. Once it does, please turn on the Sonos devices again and test once more.

If the playlist fails to load/play again, please immediately submit a diagnostic and reply here with the number given when convenient. Thanks.

I hope this helps.

I’d have thought that trying to add 5000 tracks in one go was pushing one’s luck, for any online service. Sonos apparently allows only ~15 seconds for any such operation before throwing a timeout error. (The operation can nevertheless sometimes go on to complete in the background.)

Why not break the Spotify playlist into 2 or 3 smaller ones. These can be loaded individually, then if required the queue can be saved as a Sonos Playlist.

On Deezer I make a point of limiting all playlists to 1000 tracks.

That error message looks like it came from the Spotify app, not the Sonos app. Can you confirm which app you are having this problem with? And also what happens when you try the other one?

If it’s the Spotify app’s message and it’s casting to Sonos (Spotify Connect) then the root cause could be the same.