I have set up my pixhawk and plugged all my channels correctly. However, my pixhawk will only army whe I pull the right stick to the bottom left. However I checked my params and my throttle is set to channel 3 already. How can I fix this. Also, when flying the quad (3dr diy quad kit) my quad constantly flips over and cannot even take off. I have checked the motor rotation and props and they are all correct. Also, when I do the ESC calibration everything starts up together. However about 10 minutes later the motors are out of sync again. Please help! Thanks!