Wow, i've never had that problem.
Well only once and i hit a sandstone block after taking my eyes off my buggy Hyper 8 pro which runs the same knuckles. Cracked through at the same point.
Never had this problem with my Hyper ST.

HerrSavage, what were you doing when it broke ? What did you hit ?

This may also be caused by a bad batch of these being made.