I purchase a bit of music from iTunes once in a while, and recently this music keeps disappearing. When I ask Siri to play a song, it plays something completely random, which is confusing. When I get a chance to look, invariably the song has the cloud download icon. Sometimes the download brings it back, other times it immediately turns to the play icon and starts playing some other song again. Does anyone know what's going on? There's plenty of room on the phone for music.