I have recently bought a new smart phone (Vodafone Smart Mini 4) and have been a premium account user for over a year now. When choosing to go offline, in order to listen to my downloaded playlists, Spotify keeps telling me this: "To confirm that you're still a premium user, please go online now. Thanks". However, no matter how many times i then go online with the smart phone (and through loging in on my personal computer) this message still appears and any downloaded playlists sieze to exist.

 If anyone could tell me what i am doing wrong, i would be eternally grateful! I have never had any problem using Spotify Premium before so i am very confused.