Me Too! Me Too!
3500 miles 2013 M6 Convertible:
http://www.6post.com/forums/showthread.php?p=13672391
I just posted the above query in the M6 forum and another user pointed me to your posting!
Perhaps BMW has an issue with some of the rotors on the M5/M6 vehicles? What was your build date? (Mine was October)...