I built a 4' x 8' water table plasma cutter 8 months ago. In the last few months when I first start the system and start cutting the plasma torch will cut in and out he first few minutes. After I cut a part or 2 it runs great the rest of the day. I'm using a hypertherm 45 with machine torch. sometimes the arc will cut out but the machine will keep running. Other times it will cut out move a few inches and the arc will restart right back up without me doing anyting.