Brake Light On problems of the 2018 Dodge Grand Caravan

The first time this happened I was (June 22, 2020) on my way home from the dealership where I had just purchased the vehicle. I purchased it from out of state so it was about a 400 mile drive home. I was coming to a stop light and the brakes stiffened and didn't work. Also the power steering was gone. Luckily, I was able to pull over and turn the car off and then turn it back on again. A brake light was flashing on the dash so, I pressed the parking brake release twice and restarted it again. After I did this the car seemed fine. I drove home very carefully and called the dealer. They said to take it to the closest dealer to my house. I did the next day (June 23, 2020). The only problem code they found was in the brakes so they replaced those parts. I went home thinking that all was fixed. I drove the vehicle another 500+ miles in the next week without any problems. Then on July 4th it happened again, no brakes or power steering. I was lucky again in that I could pull over and restart the car. I took it in to the dealer when they opened on July 6th. They found no problem code and said until they had it happen while they were driving it, there was nothing they could do. The first time this happened I was driving downhill slowing down to a stoplight. The second time I was driving downhill and slowing for traffic when I noticed it. I was lucky that I was not on fast highways when this happened.