Turn Signal problems of the 2016 Chevrolet Suburban

My family and I had a trip to l. A. About 2 hours away. When we were half of the trip. My truck started to flickering all interior and exterior lights. All sounds including radio and turn signal when off. After that I tried to get out of the next coming exit, before that there was a curve when the worse part happen. My truck turned off all light in the vehicle for 1 second affecting the steering wheel. I wasn't able to make the turn that was coming in front of me luckily was only 1 second that this happened then all power came back. Got out of the freeway right away. This experience was really terrible for our family and I. The motor never when off only electrical on the truck. By the way we were driving 70mph on the freeway when this happened.