DJI S900 + Pixhawk problem

Hi Everyone !
I built a hexacopter using DJI S900 frame and Pixhawk 2.4.8 as a flight controller. I got the motors to spin in sync and while I was testing my drone I noticed that, at around 30% of throttle, one (or more)   ESCs stop (every time different ones so it is definitely not an ESC problem). (See the video in the link).


https://drive.google.com/file/d/1cjb4gO3Cp8kX0CEpl6Ym6SYPQk4APSNt/view


Once I increase the throttle, they spin again. I changed the parameters min throttle and max throttle, the problem persisted. I calibrated my ESCs numerous times (although I've read it is not necessary), same result. Does anyone know the order of wiring of the motors ? at the beginning I mapped each of the escs to the same output number in pixhawk but found out it is not the proper way to do it. Also, in http://peterwedege.blogspot.com/, it is mentioned that the order is the following ( see the table bellow). It did not work ( I tested with the roll and pitch and discovered that the motors are not mapped correctly).

Does anyone know how to map the motors to the pixhawk the correct way ?
Thank you !

Pixhawk Motor-Out
S900 ESC
1
M6
2
M3
3
M2
4
M5
5
M1
6
M4

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