[Azathoth]

What is inside your gun motor and gears and spring? Very likely that your motor is just cycling and turning the gears quick enough that the cut off cannot properly engage the cam on the sector gear.

Very common problem if the gun is mostly stock and you are pllugging in LiPo batteries.

Possible short or arcing. but very unlikely.


Solution:

Trigger master, slow down the motor with the settings

Stiffer spring, Lower power motor, High torque gears can get you varying degree's of success with achieving reliable semi.