I have not heard of this problem. However, I must admit that frequently ours goes into neutral, but I believe its because I don't hit it up, or down long enough. Once in neutral, one more hit puts it in gear.
Have you noticed if it goes into reverse easier than drive? You have to go from Reverse to Drive, or vice versa?
Obviously your car isn't throwing a code, but this car is so different from a standard Benz. It could very well be a side effect of the 12v system as well. Lots of Gremlins in these cars. A really wonderful car when everything is working well(knocking on wood!). Good luck.
'15 B200 ED Cosmos Black
'16 GLE300d 4MATIC Diamond white
'18 GLS550 4MATIC Selenite Gray Metallic
San Antonio, TX