Yesterday it happen to me about 3 times or so maybe a few more than that. The air was good, i was using HPA at the moment and prssure was well above the 1500s. It just basically after firing it would stop and i had to cock it manually.

What could this be? The spring? Hammer? Sear?

The e-grip is relatively new so i doubt thats it, also i cleaned it yesterday and the sear seemed fine so did the bolt. Could it have been maybe a little dirty sear from metal dust?

I replaced yesterday the spring i had from the one in the tippmann parts kit just in case and also i'll be buying soon the maddman kit.

Any advice, thanks.

Sounds more like a valve problem, take it apart and see if there's anythin' that's outta place.
If she ain't cockin' back then there's probably some air-flow problem.

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screws too tight maybe?

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The valve i took it apart about 2 weeks ago and cleaned it, oiled it, did everything. So far it works and everything, this issue it did it a few times and it didnt do it anymore. It could be the screws on the marker that they are to tight. I do tighten them. I'll try that.

Also i saw the weekend before last that my hammer on the head it had a little piece of the lip i guess missing. I must have dropped it when i was cleaning the gun or so. Anyways im still using it like that. Could that have a negative effect? Missing a little piece on the front round part, i guess the head.

definetly! if the lip on your hammer is deformed, it can scrap along the receiver and prevent it from moving properly and damaging your receiver on the long run. I reccommend lightly sanding that deformation down then buffing out the area on the hammer with a dremel.

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Sounds good, thanks for the advice.