Haven't had any real noticeable problems, however, it's Winter and I have not even floored it from a dead stop.if I had this problem and dealer could not correct it, I'd bring in all the time then file Lemon Law applicable in Illinois. I'd dump the car.
2017 X4 28i
2016 Mustang GT
2014 X3 28i - sold, 2013 X1 x28i - sold
2006 Mustang GT Vert - sold