I've come to the conclusion that there is no rhyme or reason to why certain balls crack.
I own about 40 balls across every major manufacturer. All balls are stored in a temperate environment, and I try to occasionally throw all of them. When idle, I turn them in different sitting positions every few weeks.
The vast majority of my cracks are in Columbia equipment. I've had 3 Disorders and 2 Eruption Pros crack over the last year. The third Disorder cracked just the other night.
But I know several Columbia fan boys who have had absolutely no issues throwing the same models. I've never had a problem with my Storm equipment, but I know others who have suffered cracks across multiple balls.
To this thread, my two Radical balls (Yeti Uncaged and Guru) have had no issues. I think the OP just hit some bad luck, assuming the balls were drilled properly. I personally wouldn't avoid Radical due to a perception of cracking problems.