Were you using it for street? Or any harsh, somewhat crooked landings?
There a bit of a "flaw" in the Fox lowers, in that the arch comes in at 90 degrees to the leg, and when you spin a bunch, that corner tends to crack. Spoke to a store in Ottawa (not sure they wanna be mentioned) that went through like 15 sets.
I can't really call it a flaw though, as the fork isnt' intended for street or spinny stuff. When ridden like its intended, it doesnt' crack.