2011 BMW X6 SAV Engine Problems

WITHIN THE FIRST YEAR OF OWNING MY VEHICLE (BMW X6) I HAD ENGINE PERFORMANCE ISSUES, WHICH REQUIRED SENSORS TO BE REPLACED. AND SEVERAL MONTHS LATER I HAD TO REPLACE A WATER PUMP. AFTER OWNING MY VEHICLE FOR A LITTLE OVER 2 YEARS AND WITH 2 YEARS REMAINING ON MY CONTRACT. AS I WAS DRIVING MY VEHICLE THE ENGINE JUST DIED AT A STOP LIGHT, WITH NO WARNING. I WAS INFORMED BY THE BMW DEALERSHIP THAT MY ENGINE HAD FROZEN AND WOULD NEED TO BE REPLACED AT A COST OF $21,000.00 DOLLARS. MY VEHICLE WAS IN EXCELLENT CONDITION AND MAINTAIN BY THE DEALERSHIP WERE I PURCHASED THE VEHICLE (ERHARD BMW, FARMINGTON HILLS, MI). I INFORMED THEM THAT I SMELLED WIRES BURNING EACH TIME I TRIED TO STARTED MY STALLED VEHICLE. I THINK THE ENGINE FAILURE IS DUE TO AN ELECTRICAL ISSUE. MY CAR IS STILL AT THE DEALERSHIP IN THE BACK...