2009 BMW X5 Electronic Stability Control Esc Problems

WHILE DRIVING AT SPEEDS UP TO 70 MPH, THE VEHICLE SHUTS OFF COMPLETELY WITH NO WARNING SIGNS. WHEN VEHICLE SHUTS OFF, ALL SYSTEMS ARE COMPLETELY OFF INCLUDING POWER STEERING, ANTILOCK BRAKING, THE ENGINE ITSELF, ALL ELECTRICAL SYSTEMS, LIGHTS - EVERYTHING COMPLETELY POWERLESS. THE CAR WILL THEN NOT START FOR 10-15 MINUTES, BUT NO CHECK ENGINE LIGHTS, AND MOST IMPORTANTLY NO ERRORS LOGGED IN THE COMPUTER. THE FIRST 2 TIMES THIS HAPPENED WAS ON A FREEWAY AT 60-70MPH CRUISING SPEED. NO SOUNDS OR WARNINGS THE X5 IMMEDIATELY SHUTS OFF. WE HAVE BEEN FORTUNATE ENOUGH TO AVOID A MAJOR ACCIDENT OR SEVERE INJURY/DEATH THIS COULD EASILY CAUSE. THIS HAPPENED 5 TIMES OVER A 14 MONTH PERIOD, EVEN AFTER 2 BMW CERTIFIED FIXES. AFTER THE FIRST INCIDENT, WE BROUGHT IT DIRECTLY TO BMW NORTHWEST IN FIFE WA. THE SERVICE DEPARTMENT EXAMINED THE VEHICLE, TALKED WITH BMW US HEADQUARTERS - THEIR RECOMMENDATION WAS THAT...