So, I have an x-Valve mag that I love, but recently its started venting air from the regulator adjustment cap. It is venting from the hole where the allen key is inserted. It does it consistently in small puffs when I fire the marker and occasionally dumps a large amount of air out the back until the trigger is held down. Any help would be appreciated. I've already changed the o-rings on the brass spring seat and the small one that the steel stem rides inside.