2015 CADILLAC ATS Suspension Problems

At 38,000 miles, rear differential leak discovered. Dealership repaired leak. At 42,000 dear differential leak discovered. Prognosis: rear differential failure. Dealership replaced rear differential, shocks. Cost repairs paid by me (cadillac rejected paying repairs).

FIRST IN LINE WHILE STOPPED AT A LEFT-TURN LIGHT ON A CITY STREET. LIGHT TURNED GREEN, BEGAN TO ACCELERATE. MID-WAY THROUGH THE TURN, HEARD A "POP", LOST STEERING CONTROL, AND THE REAR END SPUN CAR INTO THE CURB. KEEP IN MIND THIS IS A 4-WHEEL-DRIVE CAR. WHEN THE CAR CAME TO A STOP, THE NOSE OF THE CAR WAS RESTING ON THE FRONT PASSENGER TIRE AND WHEEL. THE RIGHT-REAR WHEEL WAS SCRATCHED AND ABRADED ALL AROUND BECAUSE IT WAS STILL SPINNING WHEN IT HIT THE CURB. THE FRONT RIGHT WHEEL HAS DAMAGE ONLY ON HALF OF IT BECAUSE IT STOPPED SPINNING WHEN THE NOSE DROPPED ONTO IT. LOOKING UNDER THE CAR I SAW THE FRONT-RIGHT LOWER CONTROL ARM BROKE IN MID-TURN. IN ADDITION TO FRONT RIGHT SUSPENSION DAMAGE, VEHICLE RECEIVED DAMAGE TO RIGHT REAR SUSPENSION. NO DAMAGE TO BODY FROM THE INCIDENT. GM HAD A REPRESENTATIVE INSPECT THE CAR AND...