Three tire failures in * month period. The *st tire had thread separation. Replaced tir...

Three tire failures in * month period. The *st tire had thread separation. Replaced tire with matching C%S Ultra Touring, *********, SKU *****. On weekend trip, left rear tire separated and right rear tire came apart. Thread separation. I am a Service Director at a Volkswagen dealership so pretty familiar with tires. One failure, yes it happens but to have three tire fail in * months. The thread depth on these two tires and * and ****'s. The DOT numbers are U**F *CR ****. *The tire mileage is about **K. My Father-in law bought the tires as a gift for my son, so I don't have an invoice to refer to and he can't find it.*Since the two that failed over the weekend had to be replaced to complete the trip and the one the failed in February, I would like to replace the remaining tire.