In that thread one tip was to grease everything but, I first got a new head valve because the old one has damaged. It was like someone took a pair of pliers to one of the seals and bent it out.
Well the new part didn't help and greasing the hell out of the head valve didn't help either.
Any other ideas? I have since learned how nail guns work and I can't see anything that's causing the problem.
My current solution is to add a ball valve to the gun so I don't have to unplug it every time I stop for more than a minute.