2005 AUDI A4 Tires Problems

PIRELLI TIRE WITH 20,000 MILES BLEW OUT ON HIGHWAY. *

I BOUGHT 4 BF GOODRICH TRACTION T/A'S FROM BIG O TIRES IN SAN RAMON, CA FOR MY 2005 AUDI A4 2.0T, AND WITHIN A YEAR (12,000 MILES) THE FRONT TWO WERE SHOWING CRACKS IN THE SIDEWALL, ONE OF WHICH INTO THE CORDS. THAT TIRE GOT REPLACED IMMEDIATELY. THE ASSISTANT MANAGER AT BIG O, JAMES, TOLD ME "IT HAPPENS ALL THE TIME", AND "PROBABLY FROM RUBBING AGAINST CURBS". HE THOUGHT THE ONE THAT JUST HAD SURFACE CRACKING AROUND AND NO DAMAGE TO THE CORDS WAS OKAY TO NOT REPLACE "SHOULD BE FINE". ONE AND A HALF MONTHS AND ONE FREEWAY BLOWOUT LATER, IT'S OBVIOUS THE TIRES WERE ALL BAD FOR SOME REASON. THE BACK TWO: ONE NOW SHOWING SAME SIDEWALL CRACKS AND THE OTHER ONE BLEW OUT. FRONT ONE NOT REPLACED IS MORE PRONOUNCED. THE BLOWOUT HAD THE TREAD FULLY SEPARATED FROM THE SIDEWALL. JAMES, WHEN I CAME BACK TO FIND...

NEVER HAD TO REPLACE THIS MANY TIRES IN THIS SHORT AMOUNT OF TIME. 2005 AUDI A4 PURCHASED IN OCTOBER 2005 20,000 MILES DEC 2005 - RR, BUBBLE/BULGE SPOTTED, REPLACED WITH SPARE JAN 2006 - RF, BUBBLE/BULGE NOTICED, REPLACED, PURCHASED AT AUDI MAR 2007 - LF, BUBBLE/BULGE NOTICED, REPLACED, PURCHASED AT DISCOUNT TIRES JUNE 2007 - LR, HOLE PATCHED BY DISCOUNT TIRES NOV 2007 - RR, HOLE PATCHED BY AUDI MAR 2008 - LR, JUST DISCOVERED A BUBBLE/BULGE CONTINENTAL CONTI PR 235/45R-17. *TR