Car Accelerates On Its Own problems of the 2013 Ford Explorer

I enter the highway from an on-ramp and I slightly tap the break to merge with traffic. I then feel the vehicle rapidly accelerating. I see my rpms are high. I noticel the accelerator pedal fully engaged to the floor. I tap it several times to disengage with no success. I had to use my left foot on the brake to try to control my speed and use my right foot to get under the pedal to lift it. I succesfully wedged my foot under the accelerator pedal and it released, returning to normal position.

The incident occurred for the first time on 09/25/2014. When coming to a stop, the car accelerates suddenly when the brakes are applied. The problem occurred at irregular intervals in the past (approximately 4 times) and again yesterday afternoon when I was parking the car. I nearly ran over a parking attendant. I immediately took the car to kemp Ford in thousand oaks, CA. Where the service manager (patrick gagnon) ran a diagnostic on one of the module that regulates the car speed - without success. He was unable to locate the problem which is unpredictable. We are afraid to drive the car and wonder what recourse we may have at this point in time.