pilot 09 trouble

[92hatch-eg6]

hey there, i have been having trouble with my pilot 09.
The specs:
14" CP one piece classic barrel
CP short regulator
VLocity Jr. hopper
ninja 68/4500 HPA tank
ANS gear delux drop forward with on/off

every time i go out to play and get up to a high ROF my gun will burp and if it does not do that it wont recock its self. I can re-cock it and it will work but this just keeps going on over and over game after game and its getting old...any info is greatly appreciated.