All playlists storaged back to offline status

[user-removed]

One or two times on month my storaged playlists back to offline status and I need download it again. What happen with Spotify ?  Can be a android problem ? 

[user-removed]

I Will move my music acces to another type of service like Deezer because I need download my playlists again many times in a short period of time in the same cel phone device. I dont know how is the spotify problem.