Has anyone got any ideas what would cause it to stop penetrating half way through a job. 15mm MS, 500mm/m Speed if anything is a little slow. Air is a 4.5 bar and is constant and dry, Amps are at 66 (ebay clamp meter) All new consumables. It cuts fine using the hand torch and I have just put a new torch head on the machine torch. Not sure how to add a video on here.