Just upgraded all the internals and skeleton

If you are using CO2 it may be affecting the system. With a gun down straight, you could draw liquid CO2 into the internals. A siphon tube can be installed in a CO2 tank to stop or manage this. If you have access to someone's air tank, try using HPA (high pressure air aka nitrogen). If it fires fine with air you have deducted that the CO2 is to blame. Simple. Switch to air. It's better for the gun anyway! Now if the air didnt change anything I would think a component of the response trigger system is to blame. I am not familiar with the response trigger( I use E-grips) but I would think that a part that may slide or move forward or bak when you lift the gun up would be to blame. Most local shops should be able to diagnose the problem. I did find an installation video by Tippmann on youtube.
Here is a link.
A5 response kit installation

There is an O-ring up in where the Tombstone slides in. That O-ring has to be lubed (oiled)
and should be toward the rear of the gun when installing the Tombstone. Also, drop-off
in firing can be caused by lack of lube on the internal O-rings. 2 drops of oil in the inlet hole
where your bottle screws on and then dry firing to cycle the oil thru might help. You may need
to completely tear down the gun and clean and lube the internal O-rings. If you can switch to
air AKA...HPA (High Pressure Air) it will be better for internal parts and better consistency overall.
Here is your manual for reference.
http://www.tippmann.com/pdfs/products/A5/a5manual.pdf

If the trigger still works to fire the single shot, then the o-ring kit should be sufficient. If the trigger area continues to leak air, then the trigger should be replaced as well. Keep the gun well lubricated as well.

Dan

On the A5 the hopper or Cyclone feed is powered thru a small tube on the feeder side
of the gun. Make sure that tube is connected and if so, pull it off and see if air is flowing
thru it when you pull the trigger. If not, the internal passage may be blocked. Tear down
the gun and clean out the obstruction. If there is a pulse of air coming out the tube when firing
then it may be the Cyclone feed mechanism. Just unscrew the 3 phillips head bolts
under the Cyclone and observe the air driven gear drive. Air up the marker and see
what is moving or not moving. Complete replacement upgrade Cyclone gear drives
are available that say they increase performance if you cant get it moving.
Here is your manual
http://www.tippmann.com/pdfs/products/A5/a5manual.pdf

Mine did that and I cleaned the spark plug anjd thinned out the oil gas mixture.

There might be a couple of reasons for the malfunction. It is my experience that the upgrades made for Tippmann not always improve the performance of the guns, in fact they may cause problems like the one mentioned. I would try to switching your set up back to see if the problem continues and if it does make sure you have a fully loaded tank and that the internals on your cyclone are functioning correctly.

I had this problem once and the trigger was defective internally. You should be able to purchase a replacement trigger assembly at the link below.

Link: http://home-and-garden.become.com/tva6-trigger-valve-assembly--compare-prices--c205367842

Cost: $19.99

Hope this helps,
Dan

Orings, they have to be replaced every few years. Warranty does not cover them.

Any Hitachi service centre should stock them. Or find your model on Ebay:

http://shop.ebay.com/i.html?_nkw=hitachi+o-ring+kit&LH_IncludeSIF=1&_arm=1&_armi=0&_armm=20&_ruu=http://shop.ebay.com/i.html%3F_nkw%3Dhitachi%2Bo-ring%2Bkit%26_arr%3D1&_rdc=1

Hope this helps!

Thanks

The l trigger got hit hard, and a wire broke, same thing happened 2 me,not the Gears of War part but the broke button. I just replaced my controller at SEARS.

Sorry to say but i think it may be broken you can ring up xbox 0800 587 1102 and get it fixed for free

But if its not an offical controller from microsoft then i would ask for you money back