2001 Volkswagen Cabrio

I HAVE HAD 5 TIRES FAIL ON ME IN A 6 MONTHS PERIOD, THEY HAVE EITHER BEEN BLOW OUTS AND OR FLATS. I DRIVE A 2001 VW CABRIO. THE LAST 2 TIMES HAVE BEEN 3 DAYS APART, WITH THIS PAST SATURDAY DRIVING IN THE MOUNTAINS TO VAIL COLO. BY MYSELF AND MY YOUNG DAUGHTER. MY FRONT D/S TIRE BLEW IN A VERY BAD LOCATION ON I-70, NEEDLESS TO SAY WE WERE VERY SCARED BECAUSE OF THE LOCATION IT BLEW. YESTERDAY ON MY WAY HOME FROM WORK THE BACK D/S WENT FLAT. I HAD NO OTHER CHOICE BUT TO DRIVE ON THIS RISKING MY RIM TO GET TO A SAFE LOCATION. I WAS TOLD BY A FIRESTONE LOCATION THAT I STOPPED AT THE TIRE IS DEFECTIVE AS HE FOUND A HOLE THE SIZE OF AN ERASER HEAD INSIDE THE WALL OF THE TIRE AND THAT WALL WAS VERY FLIMSEY AND SOFT. I CAN ACCOUNT FOR EVERY TIME IN THE LAST 6 MONTHS I HAVE HAD A TIRE FAIL ON ME. THIS IS COMPLETELY UNACCEPTABLE, THESE TIRES HAVE ALL BEEN DOUGLAS TIRES 195 60R14 86H PERFORMANCE GTH EVERYTIME I HAVE HAD A TIRE FAIL ON ME THERE HAS BEEN NOTHING FOUND HAVING CAUSED THE TIRE TO FAIL (NO NAILS OR ANY OTHER OBJECTS THAT COULD HAVE ENTERED INTO THE TIRE) THESE TIRES WERE PURCHASED AT THE WAL-MART NEAR MY HOME, WHEN I ASKED THEM ABOUT WHAT COULD BE CAUSING THIS, THEY JUST ANSWER THEY CANNOT DO ANYTHING BECAUSE NO WARRANTY WAS PURCHASED. I HAVE NEVER PURCHASED WARRANTIES ON ANY OTHER VEHICLE I HAVE EVER OWNED WHEN I PURCHASED TIRES. NOR HAVE I EVER RAN INTO A SITUATION LIKE THIS BEFORE IN THE PAST. AS YOU CAN SEE BY THE AMOUNT OF TIME AND MONEY I HAVE HAD TO PUT TOWARDS TIRES I AM QUITE FRUSTRATED AND CONCERNED AS WELL. ANOTHER THING I WOULD LIKE TO POINT OUT, I PURCHASED 4 NEW TIRES EXACTLY 2 YEARS TO DATE ON THIS CAR AND HAVE SINCE REPLACED ALL TIRES OVER A 6 MONTH PERIOD. I CAN UNDERSTAND A TIRED THAT HAS NORMAL WEAR AND TEAR, AND THEREFORE HAVING TO BE REPLACED. BUT TIRES THAT BLOW ON YOU IN AREAS THAT COULD POTENTIALLY BE LIFE THREATENING, IS JUST NOT ACCEPTABLE. MY TIRES ARE ALWAYS CHECKED AND AIR IS PUT IN THEM BY MY HUSBAND AND MY CAR MAINTAINED. *TR