So for the past week or so I've noticed the shuffle on my phone has been heavily repeating songs (I always have it shuffle all songs). Last night I took a look, and the music on my phone has gone from circa 5000 songs to about 500. I'm on a 6 Plus (64GB). Some albums have gone completely. Others have one or two songs only. My phone had a mixture of stuff copied from iTunes on my Mac (using "manually manage"), and some downloaded via Apple Music directly to the phone. The missing music is from both sources. I'm not aware that I've done anything to cause this. Is this normal? Do I now have to spend a couple of hours shackled to my Mac to copy it all back on again (followed by finding all the ones on Apple Music)? Bloody annoying!