On September 6, 2023 at approximately 5:30 pm, I was driving approximately 30 mph when suddenly my car stopped abruptly for no reason. Consequently although with seat belt on, my head and neck were thrown forward and back. There was no obstacle in my path...the nearest vehicle in front of me was about one city block away. I had an immediate headache and my neck was hurt also. This pain lasted several hours. I had my grandson and his friend in my vehicle at the time and they were wearing their seatbelts and fortunately they were not injured.I made an appointment with the dealer and went the next day They adjusted this system and told me these things have occurred possibly because of a shadow or something else off to the side of the road. There was nothing in either case.