Warnings problems of the 2021 Toyota Venza

2021 Toyota Venza while being driven while merging onto the highway, the vehicle lost all braking power causing my wife to almost cash into the car in front of her. The vehicle was moving between 50 to 55 miles per hour. Once the vehicle was pulled over, the dash was displaying these error messages: pre-collision system malfunction; braking power low/visit your dealer; check engine; and secondary collision brake system malfunction. This caused my wife to be stranded on the side of the highway. The vehicle has 24,811 miles on it. The vehicle had to be towed to the Toyota dealership. This is the second time this happened. The first time this happened was about 20 months ago when I had just bought the vehicle new and put about 400 miles on it. The first time the dealership said they could not find anything wrong with it.

Multiple times pcs (pre-collision warning system) would go off only in city driving when I was passing a car that had turned right (and just completing turn)-approximately 45 degrees to from right of my car. The dealer said my car needed front wheel alignment and said that had been the problem. Using the computer analysis system and since I was not getting a warning light saying pcs was not working, I was told it was fine. On a recently completed road trip out of town, at 70 miles an hour, pcs through us into hard break due to a car that had just entered exit ramp-45 degrees to my car. Almost caused multicar incident. Can not get further help from dealership since computer analysis not showing issue and no response from toyoto na. Have since just turned system fully off.