I am having this issue with the PoKEYS57CNC board. Sometimes it works correctly, but I am unable to duplicate it 2 times in a row. Sometimes I get the MDI RUNNING to STOP error, and sometimes it blows right through and breaks the bit before it stops with the error message. I am using metric measurements with the folowing settings, 100 probe rate, Retract 2.54, 500 prep feed rate, 2.5 prep distance, Tool Diameter 2.4, Touch Plate Height 10. Build 3804