Owners/service Manual problems of the 2018 Volkswagen Tiguan

On 2/17/2019, my sister & I were driving west on santa monica blvd. I was driving approximately 40-45mph. It was slightly overcast. There were no cars in front of us for blocks &, luckily, no cars behind us. There were no bicycles or motorcycles or pedestrians or any other apparent �hazard� in front or on either side of the car. Out of nowhere, the car's brakes slammed on, leaving us stopped in the middle of santa monica blvd. The digital cockpit went black & a red warning light started flashing across it. I asked my sister to grab the owners manual to try to figure out what was going on. After she grabbed it, the vehicle started driving again & shortly after that the digital cockpit went back to normal. It turned out the warning light was associated with the front assist system. I took my vehicle back to the dealership on 2/21/2019. On 4/6/2019, having fixed nothing, they forced me to take my car back. They performed a diagnostic test on 2/25/2019 that my sister & I saw, but they are refusing to provide me a copy of. In that diagnostic it did show that the distance monitoring system failed in 11/2018. The front assist does not show a fail or that it has ever been activated. Because my dealership has not been able to �duplicate� the malfunction, I am being told that this a normal function of the car. Vw also wanted me to keep a journal for when this malfunction happens again - as I've explained to vw & my dealership, the next time this happens there could be an accident that results in injury or death. I was still forced to take the car back. I am too scared to drive this car knowing that there is something malfunctioning with the sensors, autonomous braking system, front assist system. I am extremely worried about the malfunction causing an accident that could injure myself, my passengers, & other people on the roads.