I've been a premium user since last year and everything was OK. But now I am having trouble with my offline playlist on mi smartphone and tablet and my PC, I cannot choose an specific song in offline playlists as before in any of my devices. It says all the time that the action is not possible offline. Since I have a windows tablet I have installed the desktop app. But when playing offline music the app says I need internet connection. I need help have already verified that I am a spotify premium user.' I cannot play music from my offline playlist :( I have windows phone 8.