I changed motor 3 with motor 4 and the problem was the same, then I changed ESC of 3 with ESC of 4 and the problem followed it,
so in conclusion, the problem is with ESC of 3, I will buy a new ESC this Wednesday and I will keep you posted on any further developments.
If those ESC’s came in a kit with the other very low quality components you can see in your posted video (like the motors) I would suggest replacing all 4 with some branded units.
If they look like this they belong in the bottom of the trash can:
Hello Sir , your first problem is also is my problem , i tried some ESCs but all have low quality , could you please advice me to use which ESCs ?
and how to know recognize the quality ESCs please help me sir