Tire carcass is damaged or hurt due to the tires because of impact or segment during the driving.
The outside cutting of the tire is called cutting blasting, otherwise it called impact blasting.
The damage is caused by impact or cutting, and some were damaged, and now become worse during driving, causing the strength decreases rapidly.

Reason: Carcass fracture, instant overflow of high pressure air within tires caused by impact or cutting that exceeding the tire strength limit on road, resulting in blasting.