DRIVING ON A 4 LANE HIGHWAY, SMOOTH WITH SOME NOW. TURNED REAR WINDOW DEFROST ON. WITHIN 5-10 MINUTES THERE WAS A LOUD BAND(SOUNDED LIKE A SHOTGUN BLAST). THE RIGHT REAR WINDOW SHATTERED INTO A THOUSANDS PIECES. THE GLASS STARTED TO FALL OUT IN PIECES A FEW DAYS LATER. MY GRANDSON, SITTING DIRECTLY IN FRONT OF THE WINDOW, LOST HIS HEARING FOR ABOUT 10-15 MINUTES. HE ALSO COMPLAINED ABOUT HIS EAR HURTING