Over the last several years of my subscription, and on multiple different Android phones, the app has constantly deleted my downloaded music. It has become a recurring problem, and as a airline traveler I rely on my downloaded library. It is infuriating. A quick Google search shows that I am not the only one encountering this issue, and that it has been a problem for years. I have multiple friends that have this issue. It is beyond time that this issue is addressed by support, and that a permanent fix is made.