2008 BMW 5 SERIES Power Train Problems

ON OR ABOUT MAY 2013 I WAS TRAVELING AT 60MPH ON THE FREEWAY WHEN SUDDENLY I HEARD A LOUD BANG SOUND AND MY VEHICLE CAME TO AN AUTOMATIC STOP. SCARED AS VEHICLE BEHIND ME SCREECHED AND TURN AWAY AVOIDING ME. I REMAINED IN THE MIDDLE OF THE ROAD FOR APPROXIMATELY 30 MINUTES BEFORE THE VEHICLE RESTARTED AND I TRAVELED FEARFULLY TO COMPLETE MY ASSIGNMENT. SAME DAY ON MY RETURN HOME VEHICLE STOPPED ABOUT 3 TIMES BUT I DROVE STRAIGHT TO DEALERSHIP. WITHOUT INSPECTING MY VEHICLE I WAS TOLD MY ALTERNATOR AND BATTERY WAS GONE. I WAS QUOTED VERY HIGH AMOUNT BUT SOMETHING TOLD ME A BAD ALTERNATOR AND BATTERY WOULD NOT START A VEHICLE SO I OFFERED TO TAKE MY VEHICLE HOME. MY VEHICLE STAYED HOME FOR ABOUT 4 MONTHS WITHOUT USE ONLY WARM UPS REVERSE AND PARK. I DID EXTENSIVE RESEARCH TO AVOID THE FRIVOLOUS AMOUNT THE DEALERS QUOTED...

BMW 535XI SPORT WAGON 2008- .. DRIVING ON HIGHWAY, ICON CAME ON ABOVE SPEEDOMETER - ORANGE ENGINE/HALF BLACK AND ON DASHBOARD BELOW NAVI READOUT "ENGINE MALFUNCTION-REDUCED POWER." FROM THEN ON WE HAD NO THRUST WITH GAS PEDAL. CAR WENT IN FOR SERVICE AND WAS SUPPOSEDLY REPAIRED. THIS THEN HAPPENED FOUR MORE TIMES. EACH TIME THE CAR WAS IN THE SHOP AND PARTS WERE THROWN AT IT AND EACH TIME WE WERE TOLD THE ISSUE WAS PROBABLY FIXED BUT THEY REALLY DID NOT KNOW WHAT THE PROBLEM WAS. THE CAR WAS IN THE SHOP ABOUT 30 DAYS SINCE THE ORIGINAL INCIDENT. PARTS REPLACED WERE VACUUM HOSE BLACK, VACUUM PUMP, PRESSURE SENSOR,REMOVED AND REINSTALLED THROTTLE, REPLACED ALL VACCUUM HOSES ON 7/14/10, CHARGED BATTERY 7/27. *TR