I had similar problems about 6-9 months into the use of my then new 2007 model. It turned out to be a bad DVD drive and the unit was replaced under warranty after 2/3 days in the shop for the dealer to first try everything else! Along with the new drive, they also updated all the vehicle software and that took care of the occasional glitch I was experiencing in error codes.

__________________
BMWs: 2007 X5 3.0
2002 330xi
1991 525i (ret'd)
1985 325e (ret'd)