Brake Loud Noise problems of the 2020 Nissan Rogue

This vehicle was purchased brand new on June 2020. First incident was in November 2020 I was driving at 55mph on a highway and all of the sudden the emergency brake was turned on and my car came to a complete stop and the car started beeping letting me know of the possible collision. There was clearly nothing in front of me but thanks to this incident I came so close to causing a monstrous chain effect of an accident and could have been fatal if someone would have rear ended me given the speed everyone is traveling and my car suddenly stopping. I took my car to the dealership it was purchased from and they "did a software update" and replaced the electric module of the car. Since that incident I am very fearful that it'll happen again. It's terrible that I'm driving a care I don't even feel safe in and still paying. Also there's this noise coming from the back axel's they sound like if there braking apart very loud and every time I back up they can even be heard and it turns heads and its terrible again I'm embarrassed of the loud noise of it and took it to the dealership all they can say is "cant hear and cant fix issue since its non-existent". Also the radio randomly will shut off and power on at any time then speakers start to sound like if someone dropped water inside of them! and again the dealerships response "no issue at the time of service" and there recommendation is to record it on my phone when it happens. Well I cant do that if I'm driving. This car is the definition of a lemon. Not happy of the purchase and wouldn't recommended this vehicle to anyone.