While turning into traffic, the car suddenly decelerates as if someone is putting on the brakes, or more like the car is dropped into the lowest gear possible. after the car is brought to a complete stop it resumes normal operations. this happened three or four times. the dealer couldn't find the problem. i pointed out a service bulletin in reference to this problem but since performing the software update it has happened again. the car literally grinds to a stop, or one out two miles an hour, in the middle of traffic almost causing an accident or serious injury. *tr