Randomly deleting off line content on WP?

[user-removed]

I've used Spotify on iOS and Android and never had this issue.  What happens is you make the content available off line, today I made 1 album available,  It was playing away, I skipped a song and the music never came on, I looked at the phone the off line button was no longer green, yes it decided delete the off line content.

Same thing happened yesterday, I downloaded an entire playlist and the same thing happened.  I thought maybe it was because I had it installed on the SD card so deleted Spotify and started again this time installing on the phone and the same thing happened.  Anyone else get this?