2018 Buick Envision Steering

While we were merging onto the highway, the steering wheel locked! I was going 50 MPH and I couldn't move the steering wheel left or right. We almost got into an accident, but I pulled my hardest on the wheel and was able to pull over. I shut off the car and turned it back on and it was OK, but under the wrong circumstances, this could've ended up real bad. Are there similar complaints on this vehicle?

LOSS OF POWER STEERING FOR @ 5 MINUTES UNTIL STOPPED AT RED LIGHT, TURNED OFF THE ENGINE AND TURNED IT BACK ON, IT WAS WORKING. HOWEVER, JUST DROVE 2 MINUTES TO EMPLOYMENT PARKING LOT. NOT ENOUGH TIME TO SEE IF IT MALFUNCTIONING, WILL NOTICE DRIVING BACK HOME.