There have been 2 incidents. First, I was going down a steep incline and used my paddles to down shift and up shift. When I entered the flat area the car lost power 25mph to 38 mph. I was unable to go any faster. This continued until I shut off car. Then it went back to normal. A few days later driving on flat streets it lost power again in the same way. I returned home shut off car and it started up as usual again. I took it to dealer and it has been with them 4 days. They were unaware of any other complaints and cannot locate the problem. I have to take grandkids to school and activities a few times a week. This is very dangerous especially on the freeway. Found similar problems on Internet.