I would start out by getting a good multimeter and use the Ohmmeter function to check the resistance to ground everywhere on the machine including to the vacuum hose and to the router body. The continuity to ground needs to be as close to 0 Ohms as possible to solve this problem including from an antistatic vacuum hose, z-axis assembly, router, etc… It is moderately complicated. This is what I did which has worked well after a lot of frustration.
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