Alternator/generator/regulator problems of the 2015 Chevrolet Traverse

Driving my 2015 Chevrolet Traverse on an expressway at 65 to 70 mph when suddenly the vehicle started to slow down even when pressing on the accelerator. The speed continued decreasing when we noticed that the radio had also shut down. Fortunately we were able to make our way to the breakdown lane without any mishap. That's when we notice the engine was also completely shut down. We were fortunate that we were able to pull over without causing an accident. We called the dealership and explained the problem and was puzzled that they were not too concerned about the problem. My wife is not concerned about the safety of this vehicle. I have noticed that complaints have been reporting a similar problem. My vehicle is currently at the dealership and they provided me with a loaner in the meantime. I was told that most likely they will not be able to find any problem with the vehicle. This is not much consolation, to us when we will be returning to florida in the near future and wonder whether this problem will occur again when we are on expressways with five to six lanes, all going 70 mph or more and with little room to get out of the way to safety. Looking at other similar issues, what is mentioned as the problem could be the switch, the battery or the alternator, or wiring to all these components. I cannot believe that this issue cannot be diagnosed and remedied immediately before someone gets hurt.