Wanted to see if anyone had information about a problem with the NAV computer system using to many amps after the car has been turned off. I've been told that the computer is malfunctioning and a new one needs to be installed for big $$$$. Is this a known problem in this model? I can't get any assistance from dealer monetarily and have been told this is a frequent problem with my model year from other sources. Give me your opinion. We are so disgusted we will probably not own another Mercedes.