Chances are you’ll need to get in contact with a mfg rep. Did you buy road hazard
warranty? If so that should cover it. Otherwise you are facing a defect situation
assuming you are correct in that you didn’t run over anything.
Read the following to get a gist of warranties/hazard etc.
http://www.edmunds.com/auto-warranty/understanding-tire-warranties.html
Thank you for your help!!