Artists' songs not saved anymore in my Android devices

[MikiNaN]

I had a lot of albums saved on my Spotify account. Eventually, all the songs were not saved anymore on my Spotify app in a MotoG 2nd gen.: I can see my list of artists, with 0 songs each. However, they are stil there on my Windows Spotify client. 

I saw a similar issue on my Kindle Fire; fixed it by re-installing the app.

Has anybody else experienced this issue?

Thanks!