It happens on Iphone too, available offline turning off

[se7inhand]

I had this problem for years, on every phone ive had Spotify installed on and its not going to change it apears. My last phone was  a Galaxy S4.  I now have an Iphone 6s Plus.  When I download an album, the "Available Offline" switch is on and stays on for a day or two then it turns itself off.  Looking in my music i can't see the little green icon indicating that I have that music downloaded as opposed to just having it saved, but when i click on that artist or album, i see that the music is indeed downloaded but the stupid switch is off AGAIN.  I'm about to try Apple music and if it doesnt have this problem, Spotify has lost a charter subscriber.