2016 Chrysler 200 cruise control problems

Tl* the contact owns a 2016 chrysler 200. While driving various speeds, the vehicle accelerated without warning. The failure recurred numerous times. While exiting the driveway with the brake pedal depressed, the vehicle would accelerate without the accelerator pedal being depressed. The vehicle was taken to the dealer where it was diagnosed, but the technician could not determine the cause of the failure. The vehicle was not repaired. The manufacturer was notified of the failure.

Cruise control is getting stuck! I bought this car in june, 2018 and every time I set the cruise control on the car it gets stuck while I'm traveling on the highway. It'll work fine on flat roads and going uphill but when the car goes downhill and the speedometer increases past what I have the cruise control set on' the engine revs up, the rpms go up to 5 or 6 (sounds like it's going to explode!). I press the cruise control cancel button and it doesn't stop it, I even mash the brake pedal and it won't stop it!