I recently purchased a Tippmann 98 custom from a retail store. I have a few attachments such as the Apex2, and Cyclone which both work great!

I installed the E-grip/trigger  on my own. I found that using the Stock "hammer/bolt" thing worked the best. The Hammer that came in the box didnt seem to work at all, it just chopped the ball up as soon as the bolt hit. 

Anyway my e trig seems to work good, however it will intermittently stop working properly. 

I'll be firing away and suddenly it will stop firing. I can feel and hear the trigger clicking while i'm pulling or hold the trigger down, but no air is being pumped through the gun and its not shooting. While this is happening the gun is still cocked and the only way to get it to start shooting again is to re-cock the gun or just pull the cock/hammer thing back about a centimeter, otherwise it will just click. I have a brand new 9v battery in there and i tried with different barrels and i tried with Co2 as well, I know the cyclone is working because I have been using it a lot without the e trig. 

If anyone has any idea what is my issue, please help me out! 

I can make a video tomorrow showing what the gun is doing if you need a better understanding. 

Thanks!