I have a Prius 2009 Touring. I now have my THIRD bubble in the left front tire in only one year's time. Replacing otherwise brand new tires is getting expensive, not to mention annoying. I know this problem is supposedly from hitting something, and of course I've hit pot holes, but everyone does. This has happened now twice with the tire that came on the car (and its identical replacement) and also with brand new top of the line snow tires. Is there possibly something going on with the CAR that could be predisposing it to tire damage during normal driving? All ideas appreciated.