2012 SUBARU IMPREZA Visibilitywiper Problems

I WAS AT A STOP AT AN INTERSECTION ABOUT TO MAKE A RIGHT TURN AND ALL OF A SUDDEN MY REAR WINDOW SPONTANEOUSLY SHATTERED AND BROKE. I LOOKED TO SEE IF A CAR HAD HIT ME AND THEIR WAS NO CAR THERE. I PULLED OVER TO INSPECT THE DAMAGE AND LOOKED FOR A ROCK OR STONE. NOTHING WAS THERE, THE REAR WINDOW JUST BROKE ON IT'S OWN. I WAS USING MY REAR DEFROSTER AT THE TIME. IT WAS STRANGE AND I BELIEVE THIS TO BE A FAULT FROM THE FACTORY. I HAVE READ THAT THIS HAS BEEN AN ISSUE IN THE PAST WITH SUBARU. THE REAR GLASS HAD NO CHIPS OR CRACKS PRIOR TO THIS SPONTANEOUS DAMAGE.

OUTSIDE TEMPERATURE: 33 DEGREES F. NO PRECIPITATION. ROAD CONDITION: DRY, MODERATELY ROUGH ROAD SURFACE. ONCOMING TRAFFIC: NONE INTERNAL HEAT APPLIED TO WINDSHIELD, FULL HEAT, AIR SPEED LEVEL 2. WITHOUT ANY EXTERNAL FORCE BEING APPLIED TO THE WINDSHIELD, SUDDENLY AN APPROXIMATELY 18 INCH CRACK APPEARED IN THE PASSENGER'S PORTION OF THE WINDSHIELD, LOW DOWN, CRACKING FROM SLIGHTLY OFF RIGHT CENTER, TOWARD THE LEFT SIDE OF THE CAR. *TR

SPONTANEOUS CRACKS IN WINDSHIELD. CAR WAS NOT IN USE AND SITTING IN OPEN SPACE. NO VISIBLE CHIPS OR ANY REASON FOR THIS OCCURRENCE. *TR