I contacted Knight about it, we will see what they say.

As far as it being the primers, I guess I can't rule that out completely, but the ones that don't go off have a dent in them from the firing pin that barely shows up. Not like the one you see after a normal firing. That is why I think there is something in the tigger assembly responsible.

I will say this, I have not had one right after cleaning the rifle. It seems to only occur about 10-15 shots into the session.