Tire Bubble problems of the 2006 BMW 330

I have a 2006 BMW 330xi with 28,000 miles. It came with bridgestone potenza re050a run flat tires. I have had 6 tire failures, one of which was a blowout, all from the same cause ---sidewall bubbles/bulges. There is clearly something wrong with these tires judging from the number of similar complaints on tirerack. Com. I have so little confidence in these very expensive tires that I've purchased road hazard protection with the last five tires at a cost of $245. I've spent a total of $1,640. 27 for replacement of these tires, even though they were covered by the road hazard protection and bridgestone agreed to replace 2 tires at half price. The huge safety concern of catastrophic sidewall blowouts is the primary reason I am posting this. Something should be done.

I have a 2006 BMW 330xi with 28,000 miles. It came with bridgestone potenza re050a run flat tires. I have had 6 tire failures, one of which was a blowout, all from the same cause ---sidewall bubbles/bulges. There is clearly something wrong with these tires judging from the number of similar complaints on tirerack. Com. I have so little confidence in these very expensive tires that I've purchased road hazard protection with the last five tires at a cost of $245. I've spent a total of $1,640. 27 for replacement of these tires, even though they were covered by the road hazard protection and bridgestone agreed to replace 2 tires at half price. The huge safety concern of catastrophic sidewall blowout is the primary reason I am posting this. Something should be done.