I had the same issues. As the air got dryer here, the failures increased tremendously. 100% unreliable. I cut short 8-12 minute runs of plastic sheet.
I already have my Dewalt router and shop vac on a separate circuit than my Shapeoko and MAC.
I added a grounding cable to my router, stock is 18AWG and I matched a new cable to fit.
I connected the Z axis to the X axis by the stepper bolts, running the cable through the cable trough, and X to the Y axis with the homing switch bolt to a frame bolt. All the frame is grounded back to the router. That has solved all my problems.
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