Engine started, but immediately started again

Hey everybody! First of all sorry if this is in the wrong subforum, unfortunately I found nothing suitable. So I had to have a somewhat more unpleasant experience with my Kia Ceed today. In the middle of the road I went out of the engine and just didn’t go on. I was lucky that someone pushed me into a less busy road. From there I had to call the ADAC and let me help. I tried to start the engine again and again. It was strange, after the employee of the ADAC was there and I was supposed to show him the problem, everything went back as usual. He then accompanied me the last few kilometers to the destination, but could not tell me what the reason was. Mistake was also without result. Sunday I drive back home, but now I’m a little afraid to stay on the highway. Does any of you have any idea what the problem might be? Maybe hil The information that I drove today from one traffic jam into the next so often had to roll in the first or second gear. Also it happens more often that in the first or second gear at low speed the car jerks strangely, so I would drive in a carriage. Maybe one of you has a guess… I will change the brakes tomorrow anyway with my father and then we will look at it more closely. Greetings, Daniel