I finished cutting out the parts last night. I set the air pressure at 65psi. It cut fine for about the first 6 pieces (30 on/off cycles) than the air would stick on again. I did what you said and smacked the side of the machine and the air shut off. So I’m guessing it’s the solenoid that is sticking. I bought the unit in the beginning of 2011 (I think). What should my next course of action be? Could I adjust it? Could I replace it? If there a way to clean it? or does this need to fall under warranty work?