Bought an outcast 4s v2 a week and a half ago. This last weekend and today I've noticed if I tap the throttle it'll continue to accelerate the car longer than I'm on the trigger. Throttle seems to be inconsistent in how much power it's giving(either backflip on a slight tap or just go normal like it should). I've done a throttle calibration and turned the throttle trim down. There were times where the car was full acceleration on its own for a full 2 seconds after I had let go of the trigger. Would this be more of an esc issue or transmitter/receiver issue?