are any of you using a capacitor plugged into the receiver? on 8th scale the servos can draw quite a lot of power and have seen the spektrum recievers get starved for just a moment which will reset it and will cause something very much like your discussing.

i suggest you get the Spektrum Power Capacitor or make one from just about any ESC capacitor and plug it into the receiver. This will store enough power to cover the voltage drop momentarily.