Quick search for "spotify disappearing" - https://www.head-fi.org/search/2437887/?q=spotify+disappearing&t=post&o=relevance&c[thread]=828402 Or "spotify deleting offline" - https://www.head-fi.org/search/2437912/?q=spotify+deleting+offline&t=post&o=relevance&c[thread]=828402 See if that helps.

​Good to know Spotify is working ok.  I know some on the thread noted a problem with the Spotify library disappearing but it seems you haven't had those problems.  What firmware are you using?

Before you run out of your patience on the X5III, read this.... probably all the Android devices has shut down sequence not clean (I had same problem last year when I had my Note 4, seems unresolved): https://community.spotify.com/t5/Android/Offline-Songs-Disappearing/td-p/1350156

Please stop blaming FiiO for the Spotify offline issue. It's a well known issue since months and Spotify does not solve it. Please read here -> Offline Songs Disappear A user posted the following: That makes sense to me. I don't loose offline content, even if I switch X5 off while playing a...

I guess that I could strictly follow their procedure, that would imply getting spotify from the play store and not the FiiO store and activate all the google related background services :( I'll do that next time I loose all library, downloading it takes a long while...