Your quick connects at your transmission are probably leaking ever-so-slightly and your tranny is probably a couple liters low. I just went through this. The problem still exists too. Its just not as bad. The tranny never overheated but I believe I drove it low for a while before I realized it and wore it out a little quicker than it normally would have.I
I would like to jump in on this. If anyone finds a fix please let me know. I bought a 2016 200c 3.6 a few years ago, and the transmission is my only complaint so far. It slams into 5th if I get off the throttle at around 55mph at times. It also feels like it hesitates to shift at times on harsh acceleration. It acts like it has to think about it. The dealer refreshed it, but it is still the same.