sporatic firing power

[phantaxtic]

This may seem like a dumb question but i am having an issue with my aeg.

My gun will fire about 20 rounds at full power and distance.
Then it starts lobbing bbs.
Its def more noticeable when in full auto as ot will begin to happen after maybe 10 rounds.

I did a full tear down and rebuild of the mexhbox to find that there were no worn parts. This is a fairly new gun.

My question is what the problem could be? I know the battery could be the issue.
Mind you the gun still shoots, just looses power sporaticly. Some times it will shoot 5 rounds fine2 lobbed and 5 fine again.

Please help

[L473ncy]

What do you mean by "lobbed"? What kind of battery are you running and what kind of RPS does that give you? Could it be you're running too high speed and you need to get a sector clip/delayer clip to prevent double feeding or something? This is just a shot in the dark, you'll need to provide more specs and description of the behaviour for us to be able to tell you what the problem is.

[phantaxtic]

Im running a 9.6 nimh 1200 mah mini

The first 20 rounds or so it fires just fine.
Then it starts lobbing bbs instead of firing.
Sometimes its not that consistent but once it starts lobbing shots it keeps lobbing.
The gun fires at 400 fps amd when it lobs shots its maybe half that at 200 fps.
It also makes a noticeably different sound.