After reading Static charge (?) causes spontaneous restart of my RAMBo - LowRider CNC / Troubleshooting - V1 Engineering Forum, I am wondering if I should add a ground wire to my controller board. I am using a brick 12v P/S that only has 2 wires to the wall plug. Didn’t seem like I had a static problem though & if I used a battery P/S when using this portable there is no ground connection. Any thoughts on this?