I am not sure this has anything to do with the subject at hand, but I do find on occasion that the song list in the instrument panel display gets out of synch with what is actually playing and what shows up on the nav screen. It is usually off by one song. It does not happen often and appears random, but is nothing more than slightly annoying...and this is a 2011 535 with the iPhone 4s in the cradle as a music source.
Merry Christmas to you all...
2014 535d xdrive ED 4/28/14 Glacier silver, Ivory Interior-Soft Close Doors, Ash wood, Harmon Kardon, Cold Package, Driver Assistant and Driver Assistant Plus, Luxury Line, Lighting Package, Luxury Seating Package, Premium Package