2014 Toyota Yaris Electrical System Problems

I RENTED A 2014 TOYOTA YARIS FROM FOX RENT A CAR AT THE ORLANDO, FL AIRPORT ON 2/26/14. THE CAR HAD SEVEN MILES ON IT. AFTER DRIVING TWO BLOCKS THE CAR JUST STARED TO COAST. I PUMPED THE ACCELERATOR PEDAL BUT THERE WAS NO RESPONSE. THE ENGINE DIDN'T SPEED UP, THE CAR JUST KEPT COASTING. WHEN THE SPEED DROPPED TO APPROX. FIVE MILES AN HOUR THE TRANSMISSION CAUSED THE CAR TO JERK FORWARD AS IF IT WAS ENGAGING AND THE CAR DROVE AS IT SHOULD. AFTER DRIVING ANOTHER TWO OR THREE BLOCKS THE SAME THING HAPPENED. BECAUSE OF THE SAFETY HAZARD OF ENTERING AN INTERSECTION OR ENTERING A FREEWAY WITH NO POWER I CALL FOX RANT A CAR AND TOLD THEM OF THE PROBLEM. A WOMAN IN THE ROADSIDE SERVICE OFFICE TOLD ME THE CAR PROBABLY HAD A TRANSMISSION WHICH COULD BE SHIFTED FROM AUTOMATIC MODE INTO A MANUAL MODE AND I PROBABLY DONE THAT BY MISTAKE. I TOLD HER THIS WAS A BARE-BONES CAR WITH NO OPTIONS AND THE CAR DID NOT HAVE THAT TYPE OF TRANSMISSION. THE NEXT DAY WHEN WE TRIED TO DRIVE IT, IT CONSTANTLY WENT INTO THIS MODE WHERE THE CAR WENT INTO THE COAST MODE AND THE TRANSMISSION WOULD NOT REENGAGE UNTIL THE CAR SLOWED DOWN TO ABOUT FIVE MILES AN HOUR. I TOOK THE CAR TO THE TOYOTA DEALER IN MELBOURNE AND THEY CONDUCTED COMPUTER TESTS AND EVEN TOOK IT ON A TEST DRIVE WITH THE COMPUTER ON BOARD. THEY COULD FIND NOTHING WRONG. I CALLED FOX RENT A CAR AND AFTER MUCH HASSLE THEY DELIVERED ANOTHER 2014 YARIS WITH 1049 MILES ON IT TO ME. THIS CAR DOES THE SAME THING.THE VIN NUMBER GIVEN ABOVE IS FOR THE SECOND CAR. APPARENTLY THERE IS SOME ELECTRICAL PROBLEM THAT CAUSES THIS MODEL TO DISENGAGE THE POWER TRAIN AND GO INTO THE COAST MODE. THIS IS VERY DANGEROUS BECAUSE YOU NEVER KNOW WHEN THE CAR WILL DO THIS. PLEASE LOOK INTO THE DANGEROUS SITUATION. THANK YOU *TR