I have two playlists, one with all my music and a second, smaller, one for my mobile phone. I added a few songs to both playlists, but the songs won't come up on the playlist for my phone. So I can't sync them and listen to them when I'm offline. Funny part is that they do show up on the other playlist, a list that isn't playable offline on my phone. 

I rebooted my phone multiple times, even deleted the app and resynct the playlist. I also logged out of the desktop app, rebooted it, nothing works. This is quite annoying, and I don't know what to do next!

Edit: Now it stopped syncing my playlist at 74%.. And it won't synchonise my local files..