THE BUTTON ON THE SIFTER HANDLE HAS BROKEN AND GETS STUCK IN ALLOWING THE SHIFT HANDLE TO MOVE FREELY. THIS HAS CAUSED MY VEHICLE TO SHIFT INTO NEUTRAL WHILE DRIVING. IT HAS ALSO ALLOWED MY VEHICLE TO SHIFT INTO REVERSE ON ITS OWN WHILE SITTING IN THE PARKED POSITION. THIS ISSUE HAS BEEN GOING ON IN A LOT OF THE SONIC AND NEEDS TO BE RECALLED. MY VEHICLE HAS ALSO SHIFTED INTO REVERSE AND HIT ANOTHER VEHICLE PARKED BEHIND ME.