2018 Ford Escape Power Train

I DROVE MY 2018 FORD ESCAPE INTO MY DRIVEWAY WHICH IS ON A SLIGHT HILL. I OPENED THE GARAGE DOOR. I PUT THE CAR IN PARK AND LEFT THE ENGINE RUNNING TO CHECK OUT SOMETHING IN OUR YARD. I WALKED ACROSS MY SMALL YARD AND THEN HEARD A VERY LOUD BANG. I TURNED AROUND AND THE CAR WAS NO WHERE IN SIGHT. I THEN REALIZED IT HAD DRIVEN ITSELF INTO THE GARAGE. IT RAN INTO MY BICYCLE, A CAR RACK AND SOME PLASTIC CABINETS. LUCKILY THERE IS ONLY A SMALL DENT AND SCRATCH ON THE FRONT OF THE CAR AND NO ONE WAS HIT. THIS COULD HAVE BEEN A VERY SERIOUS ACCIDENT. I AM NOW AFRAID TO DRIVE THE CAR AGAIN AND DON'T FEEL SAFE IN IT. I TOOK IT IMMEDIATELY TO THE DEALER, BUT THEY SAID THEY COULDN'T FIND ANYTHING WRONG.