I run a LPK and when I set my PSI a little low this will happen. I can usually just make a very minor adjustment to input pressure and the problem goes away.

__________________
A-5, APE 2.0 board and E-grip, Rhythm Innovations Mag trigger, TechT Squishy Paddles, TechT Vortex Mod, TechT QEPH, TechT Lightening Rod, GTA LPK, PPS Fatty Stab, JCS Gold Power Tube, MadDog Spring Kit, PPS 12" Single Vent Brass Barrel, PPS Apex Adapter, BT Apex, Hogs Den Rubber Grip