Spotify Logging me out and deleting all Downloaded Tracks

[therealtwain]

Hello, I'm having a really annoying issue latly. Spotify keeps signing me out (can't determine when exactly, but it doesnt only happen after an App Update) and deleting all my downloaded Tracks, which is particulary awful, because i have a slow internet connection and downloading 4000 tracks in good quality over and over takes ages. I use it on my PC aswell and i never get logged out or my tracks are deleted, so i think it has to do with my Phone.

I would be happy if anyone could help me resolve this issue or if spotify could fix it in the next update, if this problem isnt caused by my actions, rather than being a bug.

Thanks in advance!

Notes:

I'm on the latest Android Spotify Version. I store my Offline Files on an SD Card. My Android Version is 6.0.1 and my Phone is a Samsung Galaxy S5.