Originally Posted by
CallNeg151
You might also be suffering from the dreaded z-axis plunge. Does the cut just get progressively deeper until it pierces through the board? If so, for some reason the z-motor sensor may be on the fritz.
The solution to that is to call LHR, and they will diagnose your problem and likely ship you out a new Z motor pack. (Of course, you can ship your unit back, but if you're at all handy with a screwdriver, you should be able to replace it yourself, if LHR tech's are okay with it, in about twenty minutes or less, and I think there's even a pdf posted in the forum showing you how.
Good luck!