2011 BMW X6 Electronic Stability Control Esc Problems

MY VEHICLE CUT OF ON ME ON THE FREEWAY IN THE MIDDLE LANE AND TRAFFIC. MY ENGINE STARTED SMOKE. I WAS AFRAID FOR MYSELF AND CHILDREN. I HAVE ALWAYS TOOK MY CAR INTO THE BMW OF BLOOMFIELD DEALERSHIP FOR SERVICES AND MAINTENANCE I HAVE NEVER MISS NOT ONE APPOINTMENT. FOR THE LAST 5 TO 6 MONTHS. MY VEHICLE STAYED IN THEIR DEALERSHIP. THE LONGEST WAS APPROXIMATELY 42 DAYS AND ONCE I RECEIVED MY CAR MY ENGINE STARTED SMOKING SO I GIVE THEM BACK MY VEHICLE. I ASKED THEM IF THEY FOUND OUT WHAT CAUSED MY ENGINE TO SMOKE LIKE THIS? THERE COULDN'T GIVE ME A STRAIGHT FORWARD ANSWER. ON NUMEROUS OCCASIONS WHILE PICKING UP MY VEHICLE THEY ALWAYS LEFT SOMETHING UNPLUGGED CAUSING MY INTERIOR LIGHTS TO GO CRAZY BECAUSE OF THE WIRES BEING NOT PROPERLY FIXED. THIS HAS HAPPENED AT LEAST 3 TIMES IN SIX MONTHS. I'VE PROBABLY SPENT NO...