I know there has probably been so many people asking this question but I simply cannot put my finger on the cause. So I have a version 2 gearbox that came stock in a Dytac Invader recon. The things that are not stock are: SHS 12:1gears, SHS high torque Motor, Pro arms motor connectors and an asg ultimate cylinder head. Now my problem is that after a couple minutes of on and off shooting the wires, motor and lipo are getting warm, the warmth never really gets to the point where its hot to touch but its like a phone that has been used for a substantial amount of time. But I know a lipo shouldn't increase in temperature at all. I am very confident that shimming isn't the issue as I have shimmed a few guns now and the bevel and pinion are meshing well. The wires that came in the gun I quite thin and crap, 20 awg i think and am thinking of re wiring to 16 awg but i don't think that will solve the problem entirely i have checked numerous times for shorts in the gearbox, oh and forgot to mention I am running a GATE NANO SSR mosfet that does not have active breaking. Besides this slight warmth my gun is running really well and the heat doesn't seem to effect performance whats so ever. The only thing i can think of is that the lipos I am running on this gun are 1450 MAH 7.4V 20 C and am thinking that this is not quite enough amps for the setup I am running, however am not really sure what the stock spring is in the dytac. It would be greatly appreciated if anyone has any suggestions ???