I have done some further testing on this problem. First I have added a regulator right at the Plasma unit, I have the correct pressure and air supply to the unit. I have change several programs and the problem moves with each. Like I say, it cuts fine then starts cutting out, torch will light again on the next pierce, it may cut that and may not. After trying several different parts, I removed the consumables out of the machine torch, installed them into hand torch and cut non stop, with out the torch ever going out. Seemed odd to me. Here is what I know, the machine torch will cut fine with 85 amp nozzles. I can even turn the amps down to 45 on a 85 amp nozzle and it will not miss a cut. (I know I shouldn't) but it works. I just unplugged and plugged in the hand torch leaving the computer on and hooked to the plasma unit. I am not getting any fault codes in Mach, this happens with THC on or off. Machine torch has never crashed and I think is in good physical shape. I don't have enough time in on the table to rule out issues in mach, to rule out program issues. I may be missing something there. When the fine cut nozzle cuts, it does a great job. I just need to figure out which direction to go to solve the problem. Any advice will be helpful, thanks in advance.