Key Less Go problem
 

My doors Key Less Go door locks work, but only %40 on the first touch. There are times when it takes 4-6 tries to open or lock the door. Driver’s door is the worst. Yes: The battery is new. Yes: The Key is in my shirt pocket and there is no other metal keys block the signal. It works with the garden hose when washing if the key is any ware near. Having both keys around make little or no difference. My GLK was one of the first 2010’s off the line that had the key less no-go system.
Dealer first tried: Was to say that I was touching the handle incorrect and confusing the system (Open & lock at the same time).
Dealer second try: Was that MB was aware of the problem and would have a fix at the next service.
Third try: Your battery must be week (not). We will need both keys to test the system make another appointment.
The C class 211 had this problem in 2003. Is there a service bulletin on the GLK?

No issues on my GLK.

Unless I do touch both sides of the handle. But otherwise no issues. Mine was purchased Feb 2010. (Believe a Nov 2009 build).