Kia DSG / No “loosing” when operating the pedal

Hi, my sportage ( Gasoline / DSG doesn’t sporadically do what it should. Situation : Will after stop off and press the “Gaspedal”. Vehicle does not get at speed and does not start. Again “Gasgeben” and it drives off. This is not very bad on a flat track, however, this happened to me last week on a slope. = foot of brake and “Gasgeben”. Vehicle rolls BACKWARDS. } Brake} Again Gasgeben and vehicle drives normally. I was lucky. that someone behind me had about 2 meters distance. The car is BJ 2020= guarantee. A directly visited KIA workshop could not help me. 2x mail traffic with KIA customer service = I should drive to another KIA dealer. Problem is not known. QUESTION: Has this already occurred with another KIA vehicle with DSG ?