I have a PP50 that is about two years old. For the first year I only had the occasional need for it and did not use it much when the problem began, I just lived with it. Now I am using it almost everyday and would like to fix it. When I turn the machine on and make a cut, it will continue to blow air after I release the trigger. When I try to make a second cut, it will not strike an arc. I have to manually turn the switch off the machine and back on to make a second cut or to get the air to stop coming out of the nozzle. Everything works fine otherwise.