I second Mark's comments here. Bridge cracking is very common, and can be caused by a number of things. In the 15 balls I have bought from Roto over the past 4 years I've only had 1 that had an issue - and that was promptly taken care of with a replacement sent to my doorstep.
I'd have your proshop guy look at it, and if it's just minor - he can plug it as Mark suggests. A good plug job will get you a lot more time out of it, and if it's your favorite ball - probably the best way to go as that will stop the cracking.
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Dan