I have a problem with Pixhawk plane wired and power as it says in manual with secondary backup power source and Zener diode. The plane was flying well while all autumn but at subzero temperature (-5C to -15C) the plane shuts down the motor in mid air.
I fly missions 60-80 min long. It shuted down the motor while first mission, I have changed motor and ESC. 3 missions later it crash again. I did test on the ground, and the motor would turn off after 5 min runnig. I turned the plane on in the office and this is what I saw: https://youtu.be/HMyRHtuzHXk
(In the video the motor changes rpm by it self).
The motor start to spin, stop, working very in osculation way, or just spin. The way I fixed it, changed throttle output to port 6. It worked for another 3 missions, then changed to port 7 and so on. So I thought that that something burns out in output port but yesterday I changed throttle back to port 3 and it worked well. Servos connected to PWM 1 and 2 work fine, the problems follows the throttle signal wire. I also get very bad compass variance and ARHS as soon as GPS gets 3D FIX, even after calibration.
All this problems appeared after I build new plane but with LIDAR-lite connected via PWM and updated to the latest Arduplane so it could support LIDAR.