Hi Shawn,

Before I got involved in the proshop business, I had the same thing happen to the ball I shot my first 300 with, an AMF Legacy/C, about 8 years ago. I retired the ball at the end of that season, only to dig it out of closet a few years later to find it cracked. Each time I looked at it, the crack was wider and the shell kept separating from the core until a section 1/4 of the way around completely broke off. Since being in business, I have seen it roughly ten more times. Didn't matter what brand or composition, only that the balls which cracked were thin-shelled. I asked several ball reps about possible causes and they seemed consistent in their responses of excessive glue use when installing  grips and slugs. I do remember taking the Legacy to my then driller and having new grips installed mid season that year. He pried the old ones out with a screw driver and the new ones were really glued in. LOL