That static build-up is one of the common problems with the CNC Sharks and the cause of many missed steps. It might be due to all of the plastic used in their manufacture, I think the plastic helps store the static. I actually taped a fine florist wire to the plastic on my Z axis, pointed straight up so I could see how much shutter I was getting while cutting and that also seems to be bleeding the static off of the system. I realized the static was gone and removed the wire to see if it came back and the static returned. I put the wire back and no longer have problems with static. It might be discharging to the dust collector hose close to it.
Sometimes the discharge will take place when the on-off switch of a vacuum is used like when cutting without a dust shoe and switching the vac on and off to clean up lose chips intermittently. When that happens a noticeable misalignment of the cut path will be seen, maybe deeper, shallower, or jump to one side or the other.
The copper wire through the hose works and can be grounded to an outlet or better would be to install a ground rod outside the shop with the wire running to it.
Your BRAIN Is The Most Important Power Tool In Your Shop. Turn It On Before You Turn On Any Other Power Tool.
A Disability Is Only A Disability If You Let It Be One