iPhone 4, iOS 6
Started happening once I got over a certain number of playlists
Just rushed to download the new iOS version. Started syncing a playlist immediately after doing that. The app crashed, and I was returned to a previous version of my list of playlists. Oh well.
Good news everybody!
Our problem can be fixed with some resets on your account. Contact @spotifycares on twitter
I contacted them two days ago with a link to this thread.
Explained them the problem, and they carried out some resets on my account.
You'll need to uninstall the app and sync your playlists again after that but my problem is gone!
I've run tests with the wifi, 3G, Edge, low-connection and flight-mode and everything works great (with both the old and new versions of the app).
Hope it works for you all