Its happened at-least a dozen times in the last 10 days or so for me . Been happening on all builds of IOS 9 for me. Its never happened in IOS 8 before. All my music has been purchased on iTunes. Anyone knows why? Thanks in advance. I'm going to remove all the music and download them over again and see if they got damaged in someway while download from itunes. Has anyone heard of an instance like this?