App logs itself out

[dmobbs76]

So after trying everything you've been telling me to do the problem still exists. If this can't get corrected I'm canceling my subscription which is unfortunate since I've been a customer for 2 years. Here is my problem. I have an iPhone 5s that I only use for music. The only app on this iPhone is Spotify. No iTunes , nothing else. This is also the ONLY device I run your app on. I have about 1700 songs saved on my subscription. I like to listen to all of them offline. So I download all of them to the iPhone to be saved for offline use. My problem is after I spend 10 hours downloading all my songs to use offline I get to listen to them for about 2 days before I lose the ability to play offline and have to re download all of them!!! Somehow the app is resetting itself after I turn my iPhone off . I never logout of the Spotify app ever! When I get out of my car I simply shut the iPhone off . Then when I get back in my car and power on my iPhone somehow the app has logged me out and asks me to sign in again. When I do all my darn songs can't be played until I find wifi and redownload everything!!!! I'm sick and tired of this. Never happened to me before in any phone. Just started the end of May doing this. Spotify version 8.4.3.884 is on the iPhone. Helppppppppp