Spotify log out when handy was started new

[xLordLucifer]

My spotify logs me out when my handy was restartet and i cant log in i need to reinstall it, and then i need to download all my playlists again i use a sony xz Premium and when there is no chance to get the problem away i need to leave spotify cause i rlly need the offline mode and i use Premium now for 1 1/2 years and never got a problem, on my sony z5 i dont have this problem pls help