I was cutting 1/2" ply and everything worked great. It was zeroed out to the top of material. Then i switched to 3/4" material and didn't 're zero just assumed it would know the difference. It cut the dadoes 1/4" too deep. It said it was cutting at .755 when cutting out body parts on the final pass but actually cut into the bed about 1/4". Then out of nowhere cut into the side of the cabinet. I ran the same file the next day without loading any material on the machine and it ran just fine. This has happened to me twice now. Just wondering if someone had any idea what is going g wrong.