Tire Bubble problems of the 2001 Chrysler Sebring

The contact owns a 2001 Chrysler Sebring. The contact purchased four new continental extreme dwsxl (na) tires, line size 251/50r/17c February 2010. The contact stated that the front passenger side tire developed a bubble on the sidewall in may 2010. The contact purchased a new tire after the tire dealer offered no assistance. The contact stated that the replacement tire also developed an abnormal bubble on the sidewall and the tire was replaced. The contact stated the tires were replaced six times within one year. The failure mileage was 30,123 and the current mileage was 41,441.