Futuba 2.4 radio question

[speed demon]

I just got it today and hooked it all up and now it's acting weird. I reversed both channels and everything works fine for a min but then the throttle will stick and spin the motor to max rpm for a few seconds then it will stop. The steering will also go max for a second or two then return. It's on a rustler with stock chassis and over two inches away from the CC ubec. Will running 5.1v affect it? Oh the bats in the controller are fully charged. Any help would be great.