Make sure that the EPA (End Point Adjustment) of the servo is properly adjusted as if not it will be getting to the travel end of the cars steering geometry then continuing to pull causing a spike in current drawn and the dropping of power to the motor / esc.
What radio do you have? Anything half way ok will have EPA. Just set it so the servo is not straining you will see the steering stop traveling and the servo trying ever harder to move the imovable wheels.
A capcitor would help somewhat..
G does a Nortech Super Dogs Do Dahs one which some say has been eaten by the devil prior to make it even harder!
Other than that a External BEC of 5amp rating should solve the issues if nothing else does.
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