Mine is doing the same thing and the blow tip isn't helping. It's my own fault I suppose. I cut like 300 pcs of door sticking for columns and wainscot and my Kapex/Midi kept popping the breaker where I was working. My solution was turn off the vac. The material was really small and the vac wasn't an absolute necessity. Only problem was I didn't disconnect the hose from the saw. This just filled the guard/mechanism full of powder. Guess I will be breaking it down today. I may try my aerosol Paslode gun cleaner first but want to make sure it doesn't affect the clear plastic guard.