are the defective latches physically damaged?
make sure the shocks are good and the machine is level and on a sturdy floor
if the machine bounces too much the tub can bump into the latch smashing it
other than that i cant think of anything to cause the latches to fail
i do alot of frigidaire warranty, and i dont change all that many latches
also... when clothes are being removed from the machine, if they are tangled and someone yanks to remove them the drum will come forward and smash into the latch