NHTSA Complaint #11620345 — 2020 NISSAN ALTIMA

My issue began 1 month after buying the vehicle. Regardless if I'm on the highway or back road no transition from one lane to another needs to be initiated , my whole dash will light up red and the car will come to a complete stop , at this time I just hold on and brace myself .Im a RN w/2 kids I went back to the dealer they said they checked it out but on my own I found out the car was in 2 accidents those things were not revealed to me during the buying process. I didn't know how to report this Im pretty ignorant to this type of thing however I did complain to gm by way of phone few times I called early on. No one at the dealership will help. Im literally in fear of me and my children's life. I test my luck because I don't know what else to do and can't afford another vehicle. Please help this complete dead stop sometimes turns the back end of my vehicle if im going over 70 when it stops, for this reason I drive like 40mph. I hope knowing this issue you can help there is no reason I know of for this incident which is now happening approximately once a week. Again this happen almost immediately after buying ,I went to the Mngr no one will help but this is very scary for me and two children will it take a nurse dying in an accident before someone does something , I dont now what else to do Again out of nowhere no matter the speed the dash turns red all lights come on and vehicle comes to ABRUPT STOP.Thank you and its at this point once a week,by the way I only guessed the parts involved d/t effects of incident I do notknow which or what from the car would have these issues from because I absolutely bought it like this