NHTSA Complaint #11432545 — 2014 CHEVROLET TRAVERSE

One day as I was driving on the freeway, the vehicle's engine light/airbag light came on and the vehicle then went into "engine power reduced mode" I was lucky to be close to a turn-off. I was able to get the vehicle off the road safely. I turned off the vehicle and check it. Then turned the vehicle back on and all lights were off. It was shocking, the car was driving normally. I did not think twice and took it to the dealership. They told us it was just the battery and airbag sensor. Thankful they changed it, no cost to us. But later this happened again, this time it was the "engine light and traction control off". We have no idea what it is. Because we have taken the vehicle to a mechanic to get checked, but they can't seem to find anything wrong with it. This happens several times. Can I have some answers or help to stop this from happening. At this point this vehicle to very dangerous to drive.