http://www.google.com/url?sa=t&rct=j...QNFyu70IsyKRlg
Is your battery good now?
The IBS has can turn off stuff is the battery is low to keep
the car going see above link for details.
If you have any warranty take it in ASAP.
http://www.bmwradiorepair.com/?gclid...FccbQgodIEn0Cg
If you have a car that is 06 or 07 you are probably due for a battery.
otherwise no clue.