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Ok, make sure to check all electrical contacts from point A to B
Do this because you're running the 11.1 batteries
The increased torque, speed of rotation, current and heat produced will cause significant wear on the brushes and the trigger contacts. This will also, over time, make the contacts brittle
If I can offer some advice you could try going with a brick RC LiPo that isn't 11.1 it might slow your rate of fire a bit but your not trying to force a tidal wave of electricity through a soda straw (a bit of an exaggeration but not far off depending on the quality of wiring and components)
I'd also try and track down spare motor brushes and also check you've got solid connectors
Most if not all aeg's come with either Tamiya type mini or large connectors, these are notoriously bad as the female ends flare as they heat and contact issues arise
Most switch to Deans or the like for a more positive connection between battery and AEG
Also, if you do look at the brushes, check the commutator for black spots or Hot spots , you can gently place the file on it and turn the top gear and then some very fine sand or Emery paper, blow it off well, spray again with contact cleaner and reassemble with brushes
If your really ocd you can put a light coat of dielectric grease on the trigger contacts and motor pins or just sauder the pins to the motor with a small dab of Sauder, easy to service when needed
If you can do this and the gearbox is already built well, shimmed correctly, angle of engagement and ball bearing spring guide, piston head and quality bearings it should run reliably for a very long time
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