2022 Nissan Altima SERVICE BRAKES,FORWARD COLLISION AVOIDANCE

Since purchasing my car in 1-2022, brand new, my car will unpredictably brake. Recently while driving with no cars in front of me, my car again braked and I was almost rear ended. I did experience minor whiplash as it was a sudden stop. This has happened on surface streets as well as when going down into a parking structure. Additionally my sensors will randomly state that there are obstructions in the road when there are none. I have taken my car into First Nissan with these issues from when I first drove my car off their lot. First Nissan employees are great, but I believe my car has a defect that significantly concerns me about my safety when driving this car. I am a loyal Nissan car owner as I had my previous Altima for about 15 years.. with no problems. How will Nissan rectify this safety issue??