Check Engine Light On problems of the 2013 Chevrolet Camaro

This has been an ongoing issue since 41,000 miles. (Feb 2015) after driving a few miles in a day, you can feel a change in the vehicle drive and the rpms reduce to under "2" and then down to "1", the car then displays the "!" "reduced engine power" warning. 3 emergency lights come on and the check engine light comes on. When safe, I pull over and turn the emergency lights on, turn the car off, wait a few minutes and then restart the car. For a few seconds the "stabiltrak" warning light comes on. The car then drives sluggish and will not go over a 40 to 60 miles speed. This continues to go on every 3 to 5 miles. We have been taking the car to dealer and they have replaced a connector, wiring harness and a ecm module. After a few miles of driving the same situation occurs. This last time when I safely pulled over to a side street and turned on the emergency flashers in the early morning hours a car almost rear-ended my vehicle. The reduced speed while driving on the freeway is causing a frightening driving experience because other drivers do not realize that my car is experiencing engine reduced speeds that I have no control of and I cannot exit the freeway until an exit ramp is available. I do not feel safe pulling off to the side of the freeway due to the re-entering onto the freeway with disrespectful drivers who cause life threatening issues. Researching the issue on line it seems there are too many with the same issues. I did read that the onstar system may be causing the conflict??? this issue has become very time consuming and expensive with the missing of work. How do we get this corrected. It started at 41,000 miles and we now have 91,000 miles. We do have a premium extended warranty to 125,000 miles. The warranty company said that general motors should / must correct this issue and it is a known issue.