Dear Spotify,

Spotify did it again. I am a premium user with 2000 offline songs at least. I like this service so much, I am relying on it for my entire music library, and I have less than 3 MP3 albums on my phones, only the few that are not available on Spotify.
It also takes 3-4 hours to backup all offline songs to my phone with a fair Internet connection. This morning, switched on my phone, was about to go on a 4 hour-trainride, opened Spotify to get in the musical mood of the day.

There it was, that weird "Log in / Sign up" screen once again. I log back in, to find ALL MY OFFLINE MUSIC HAS BEEN DELETED just like I was never logged in to Spotify on this device. I used it yesterday and it worked fine, my subscription payment is up to date.
I don't know how this bug is not important enough it wasn't fixed. I cannot afford at any time to lose 3 hours of my time to re-backup my entire offline music because I got logged off the app for no reason.

Any idea? Do you know if they plan to fix this?

Julien.