Quadra 42 and Futaba FP S148 servo twitches
Today, I flew the maiden flight for me of a previously owned giant scale plane with Quadra 42. It had several Futaba FP S148 servo twitches of the ailerons when flying it and that forced it off the runway when landing (no damage). It has a 42-percent products Z kill switch that is located in the fuselage more than 24 inches from these aileron servos. I have a 6 volt battery that read 6.5 volts under load test when checked after landing.
What may cause the Quadra to interfere with Futaba FP S148 servos to cause twitching of ailerons?