Core One crash/restart  

Core One crash/restart

I've been having a strange issue with my Core One in that after a print, sometimes the printer would just turn itself off and restart.   Was only after the completion of the print.   Bugged me for the last couple of weeks but tonight I finally determined the trigger (if not the root cause).

I've been careful to remove the print sheet and let it cool before attempting to remove the item from the sheet. So what I do is place the print sheet on top of my circular bin for a few minutes until I can remove the part. Then I stand up and walk back to the printer and replace it on the heated bed again. This all sounds pretty normal I can hear you all think - except every time I get off my chair and go to the printer I get a small static electric shock when I touch the case (the fault is my chair and shoes, not the Core One).   But, when I'm carrying the print plate back to the printer, the door is already open - so I'm discharging myself through the plate into the heated bed. At this point, the printer resets. The printer doesn't reset when discharging through the chassis.

So is the heated bed not correctly earthed?