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I'm using HKpilot (APM 2.5). After the whole charade of caibrating accelerometer, compass, radio, failsafes etc. I set the APM to Fly by wire A mode and arm it. It shows a solid red LED. When i try to test out with radio, everything works fine but on moving the roll stick rapidly left to right, the APM gets disarmed automatically. This is only happening with the roll stick and nothing else. Please help