2011 Buick Regal stability control problems

While traveling 55 miles per hour on the high way the car shut off causing me to force the wheel on the road. I reported this and was given rental cars for the noises and belts to be examined. The noise subsided a few weeks only to return when driving about 45 miles per hour and the car cut off again. This time in traffic march 2013. The third time was in april 2013 . The last time was june 16, 2013. It has been in the shop over 45 days. Nothing was told to me was wrong.

I was driving down the city road and my car just shut off and lost all power to everything. I almost got hit. I then turned my car back on and the service stability trac light came on and the check engine light was flashing. I could nearly get it to go at all and my car was shaking and sputtering. It was the scariest thing I have ever dealt with. I had it put in the shop on 10/26/2018 and now it just happened to me again and its 03/26/2020.