Mine does this too. if you hold down that power button, it "fixes" it, but is still annoying as hell. I have taken it to the dealership, but it still does it occasionally. Sadly, this is the least of the problems I have with this POS car, as I have the won't start issue as well, and they have been trying to fix my car since APRIL. It has been back and forth to the dealership so many times, I have lost count. Mercedes is fighting me tooth and nail to prevent a buyback as well. I have a lawyer, but it has been a sloooooow process. they tried to offer me $3000 (which is less than they initially offered) to keep the car "as-is." i would tell them to go **** themselves, but I don't think that will help me get resolution any faster. I am now going for a full buyback as I do not trust Mercedes one bit and will never buy from them again.