Cruise Control problems of the 2010 Buick Enclave

Twice within the past month when driving on the interstate while using cruise control my vehicle automatically started accelerating uncontrollably. Depressing the brake pedal did not disengage the cruise control or stop the car from trying to accelerate. In both cases I had the wherewithal not to panic, contol the vehicle to the shoulder, put the car in neutral and turn the engine off. After restarting the car the engine immediately continued to accelerate and trottle up to 4000 rpms while still in park. Fortunately, both instances occurred on straight stretches of interstate during less than crowded hours. I shutter to think if this occured while my kids were driving. I am filing this complaint in hopes that if there are other cases of this happening we can make sure gm can fix this before anyone gets killed. I know other automakers had this problem and were able to correct it through recall. I contacted gm/Buick with my concerns and they acknowledged that this is indeed a safety concern but since my warranty is expired there is nothing they can do but advise me to take it in for repair at my own expense. I have a video I took after the second occurrence once I was able to pull my vehichle over and try to restart it. I am not able to upload it through this form but I can send it upon request.

I was in the passing lane on a four lane interstate highway driving over an overpass near rockport, mo. My speed/cruise control was set on 70 mph. There were one or more cars ahead of me in the passing lane and I was passing a semi-truck in the right lane. My vehicle started to speed up, without any input from me. I tried multiple times unsuccessfully to brake and could not slow the vehicle down. I changed lanes in order to not hit the car in front of me which we were almost upon. In doing so, the semi-truck clipped the corner of the vehicle. I was spun on to the shoulder and then rolled several times down the 65 foot embankment. The vehicle was totaled. The passenger sustained bruising and loss of consciousness. He had to be extricated from the vehicle and was taken by ambulance to a nearby hospital and then subsequently airlifted to another hospital. I sustained a compound fracture in my clavicle, 5 broken ribs and a cracked pelvis. I was hospitalized for three days.