The Spotify playlists visible in the Sonos application (PC-based as well as Ipad and Iphone) are not updated after I have changed, created new or deleted them in the Spotify application (PC-based as well as Ipad and Iphone). All other Spotify functionality within Sonos works e.g.. I can listen to my old playlists, I can search and listen to new music etc. 

It is not that the updating is slow (a few minutes or so), the playlists are not updated after several hours.  I have restarted all systems without success.

The problem is new to me (I do have old playlists!). I have noticed that some users have experienced similar problems a few months ago but I have not found any solution. Any ideas to solve the issue would be highly appreciated!