Goodyear — Two tires damaged due to rubber property has air inside

I owned Hyundai Xcent VTVT AT from downtown, Chhani road, Nizampura Vadodara. My car has 5 tyres of Good Year including stepney. I used not to travel much and ran 22, 000 km till time. From last few days I have been facing car rolling and got inspected at Hyndai authorized workstation. Service engineer replied that the two tires' roadside surface middle layers are increasing in size (rubber property has air inside). It was shocking to me as I have already replaced my three tires because of this same issue with 20, 000 runs. Realistically, I use my car for domestic purposes and it runs in city areas where road condition and air pressure is healthy and hard to digest how the tubeless tyre gets bulged (air inside the rubber property) without any significant reason. It seems like a manufacturing defect and requesting you to help me out.

My contact# [protected]
Regd# GJ06KP5393
Email- xanon.[protected]@gmail.com