2015 Chevrolet Traverse drivetrain & axles problems

When making a sharp left turn in a parking lot the car started to roll backwards down a slope. It was discovered that the engine was no longer running. Placed foot on brake to stop vehicle from rolling back wards and put transmission into park. Put transmission back into drive and found that car was dead. Put into park turned key to off waited a second and turned key to start engine and it restarted.

While driving, the interior lights shut off and my vehicle suddenly loses power. No matter how hard I press on the gas, the vehicle does not respond. Certain service signs also appear and they are 'service stabilitrak,' service traction control,' 'traction control off,' and 'park assist off.' this is dangerous as I was driving through a fairly busy street when this happened and had to physically notify the driver coming towards me to stop. Otherwise, I would have gotten t-boned! This happened twice.