" on a shelf in the basement
never moved" That's one of the thing's they say you shouldn't do is let them sit static for long periods.
There's a laundry list of theories on what causes a ball to crack, whether it's the filler expanding or the cover compressing or moisture evaporating from the ball etc.
It can can be one, none, all or a combo of reasons. The thing is just do what you can to prevent it.
Some of the main things are make sure the holes are beveled, store at a constant temp, rotate them every few weeks and if your going to storage for a long time wrap them with plastic wrap or put in a plastic bag so they are not exposed to the air.
Will any of these guarantee they won't crack "NO".
You just got to live with it these days, Balls can crack.
Here's a link to a thread about long term storage:
http://www.bowlingboards.com/threads...m+ball+storage
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