Tire Bubble problems of the 2000 Audi S4

This is my 2nd time replacing bubbled tires. (tiresize: 225/45 17).

Bubble in tire sidewall after hitting pothole. (tiresize: 225/45-17)( dot number: tire size: 225/45-17 ).

Sidewall of front passenger tire has bubbled in two locations without a catalyst of any kind. (tiresize: 225/45r17)( dot number: tire size: 225/45r17 ).

Each of the tires have bubbles all occuring at different milages. 2 replaced and both bubbled again after only 3000 miles. Live in the chicago area roads are not the best but other cars don't have this problem. Other 2000 Audi S4's and Audi tt's are experiencing the same problem. . Read more...

Side wall bubbles on both front tires. Audi disavowed any knowledge of a problem in June 2000 (tiresize: 225/45/17)( dot number: tire size: 225/45/17 ).

2 bubbled tires at 3000/6000 miles( dot number: ejh8cfe 24 tire size: 225/45/17 ).

Developed tire bubble spontaneously without hitting anything such as curb or pothole( dot number: tire size: 225 45r17 ).

Tire had a big bubble. Did not know it had one until I had read about it on the Audi user web-site and then checked my car. Probably happened on the bumpy cross bronx expressway on a cold day. I have not had another problem with the other tires. ( dot number: tire size: 225/45 r17 ).