Q: Has anyone had issues with the power tailgate not closing on the first attempt. on 2010 Mercedes-Benz ML350

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On an irregular basis when closing the tailgate it will descend approximately two inches then return to its full open position. Upon depressing the closure button a second time the tailgate will properly close. It usually will not repeat this issue immediately following its occurance, but sometimes it can be duplicated numerious times. This has occurred dozens of times. Nothing has been obstructing the doorway. The dealer states the closure sensors are functioning properly. I got it to misbehave at the dealership one time. They are clueless. Does anyone have any experience with this issue?
(1) Answer
I have a 2006 ML350. I have the same problem. What I found was on the passenger side of the tailgate, a bolt looked loose (on the top of the door) but when I checked it further found that it had broke in two. The power latch still works but sometimes (not always) I have to try 2-3 times for it to work. The dealership says the bolt needs to be drilled out but they wont do it and said to take it to a body shop.