Lost all downloads of offline songs

[federicobalasso]

It all starded a couple of weeks ago: I was listening to my downloaded songs in offline mode. At a certain point, after choosing a random song, I locked my screen (as I usually do with no problems). Suddenly Spotify starded pausing the songs every time I locked the screen. So I decided to switch my iPhone off and turn it On once again. Every time I do that, I constantly loose all my downloaded songs. Please help.