I have a Blade 500 3D that I converted to FBL and am using a Tarot zyx-s 3 axis controller. When I power up the zyx controller the two front servos (aileron and pitch) do not power up. If I unplug the servos and plug them in again, they then power up. I tried a new BMS 621 digital servo and it powers up when I power up the zyx controller. Do I have bad servos or do I need to change any programming parameters? I have set the zyx to digital servos 1520 micro centering and 270 hz. I am holding off on test flying the heli until I resolve the servo issue.