This is the second time this has happened to me... When opening the iPhone (6s) app I was asked to log in (even though I didnt log out), but when logged back in all music saved for offline was showing as needing to be redownloaded. They green arrows had turned to grey.

This time it happened after the phone crashed from a low battery - my iphone likes to shut down anywhere below 15%. And Im pretty sure the last time it happened after a iOS update.

Anyway, my account is always in good standing and this is incredibly inconvenient. It causes me to use data I shouldnt have to and takes forever to re-download everything.

Any idea whats going on?