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- Hey! Apologies for Necro'ing this thread but I think I have the exact same board and machine as you, and was running into the exact same problem. I don't know if you wound up solving your problem, but the change that worked for me was two fold:
+Hey! Apologies for Necro'ing this thread but I think I have the exact same board and machine as you, and was running into the exact same problem. I don't know if you wound up solving your problem, but the change that worked for me was two fold:
   * twist the spindle wires together between the motor and the board, adding a shield if necessary (I eventually removed the shielding when I accidentally damaged it)
   * solder a 0.1uF ceramic capacitor (make sure it is bidirectional!!!) between each terminal of the spindle motor to the spindle motor body itself. Ideally, you would also solder a third capacitor between each motor terminal, but I did not do so and have not yet had the random dropouts I did before.
+Hi guys, after long time dealing with exactly the same problem I figured out that the power supply of mine 3018 is insulation class type II, it means that there is no connection of the CNC ground to net ground, so the entire frame/circuit is "floating". Also, there was no connection between the controller board ground and the frame. It makes it very sensitive to electric noise! So I installed a **ground wire fixed from the frame to the controller** board AND a **connection from the frame to the nets** ground and all problems desapeared. So instead os be changing cables, installing pullups and pulldowns or changing configurations my recomendation is "make sure it is all ground connected.