Software problems of the 2011 Chevrolet Tahoe

Our Tahoe accelerated on it's own 3 or 4 times at different speeds. In each situation putting on the brakes would not stop the vehicle. I was forced to enter high speed traffic and get into a center turn lane just missing an accident. I put the chevy Tahoe in neutral which allowed the engine to race to a point it could/would have blown. I was able to turn off the ignition but was in the middle of the road. My wife will not drive the car and will trade it for another brand. Each of the times this happened it was at different speeds & the speed control was not on. Turning off the chevy Tahoe allowed it to restart each time so we could get home. Gm like all car companies diagnostic software is not designed to signal the causes of these intermittent types of problems thus they can go on for years before getting fixed. This is the fourth gm vehicle over 20 years & all have had electrical issues and unless multiple people are killed gm keeps doing the same poor job.