WHILE DRIVING THE VEHICLE, I WENT TO REVERSE AND TURN AROUND. WHEN I SHIFTED INTO REVERSE ALL ELECTRICAL SYSTEMS FAILED, BRAKES NO LONGER WORKED, AND I SLOWLY WENT BACK UNTIL I HIT A SMALL CONCRETE PILLAR. THIS PROBLEM HAS HAPPENED NOW MULTIPLE TIMES, AT RANDOM SPEEDS AND RANDOM TIMES. IT'S NEVER SET ON A SPECIFIC MOTION OR ACTION.