I made a crawler with a 2 speed transmission and have 2 servos one for steering and other for transmission overheat ecu and I lag then loose steering. Spektrum sr6100at receiver and spektrum 40a waterproof brushed ecu. Steering spektrum s614, other and have had other ones in and still does it but it's a Traxxas 2075 on aux 3 channel. Just messed with it and had no steering and ecu starting to really heat up quick.

Pull all servo's out of the receiver and try one by one which one is causing it.

It's possible that your servos are drawing too much current for the BEC of your ESC. According to the ESC specs, the maximum burst current for that ESC's BEC (the circuit that provides power to the receiver and servos) is 3A. That means that the continuous current is probably much lower. Drawing current close to the limit will most likely overheat the ESC. You can check that the end points of your servos are properly set, meaning that you have to make sure that the servos are not trying to go further than what they are trying to move allows, If they bind, they will draw lots of current.

Martin Paradis