Yes I believe mine has done something like this, now when I hit sync the desktop app freezes and says there has been a problem, call Microsoft for Support. I'm transfer all my non-iTunes music (xbox music dloads) to my computer and clear my music in my phone. Then I'm resync with iTunes with the desktop app, and add the xbox music songs in with the windows phone win8 app. Microsoft really needs to make a better syncing method with there stuff. Its really bad.
They seriously need to revisit the Zune software...
