car doesnt turn on. on 2007 Mercedes-Benz CLS550

the problem im having is my car doesnt turn on aleast twice a week. ive taken it to the Mercedes Dealer 2 times, i just got the car back a day ago and it cut off and doesnt start, this is the third time...can you tell if you heard of this problem.

thanks for your help

Asked by for the 2007 Mercedes-Benz CLS550
Sure, we've all heard of this problem in all kinds of cars. Not trying to crack wise, but that's not much info to work on and all kinds of cars can stall out or fail to start. If the MBZ dealer is not satisfying you, take it to a MBZ specialist.
Here's a directory link for you:
1 more answer
try cam shaft positioning sensor, i had the same problem