At first, I have the jumper connected on JP1 to use a single power to power both the servos and the APM 2. Since I've noticed the servos were twitching at random time, I've removed the jumper and use a separate ESC and battery to power the APM and the servo output rail separately. But the servos still twitch.
I also used another servo from a pan/tile camera mount to plug into various places to try to find out where the twitching come from. The receiver signal is clean. The twitching only comes out to Ch.1, 2, and 3 from the APM outputs. The Ch 4 rudder doesn't have the twitch. What might have caused it?
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