"Yes connecting each ground of each ESC to Pixhawk will solve your problems !"

""The first reason being that in the complete population of receivers we tested (Spektrum, Futaba, FrSky) the output voltage was 3.0 to 3.3V."
"even though the rest of the market uses 3.3V"....
The market of what? Receivers? Is the Pixhawk a…"

"Hi My investigations about pixhawk sync issues :

https://www.youtube.com/watch?v=-9zJGnogRbM&feature=youtu.be"