I dont have any personal experience with one, but from what I've been able to tell it may just be an inferior design. The material itself maybe lacking abit, as it seems that they all come apart at speed, ie. high RPM,s...this may be the reason why you dont see them comming apart on start ups or at idle...just a guess on my part and only that. But if it were me, seeing that would be enough to make me replace it.

good luck,

Casey