There is a gap that allows dust to get into the control board box. It’s not a big deal until you are machining a conductive material, such as brass. The dust builds up on the exposed connectors, and causes shorts, resulting in random disconnects (in my case).
My superior engineering knowledge and skill has allowed me to come up with a brilliant fix:
I stuffed a piece of paper towel in the hole,
Perhaps the welcome kit for new purchasers should include a piece of paper towel, in case they don’t have some handy.
I hope you get a laugh out of this… but seriously, the hole should be plugged!