"I also had this problem also.
I my case, I made some adjustments to the throttle curve on my TGY 9X transmitter and apparently the APM didn't like that.
It is a long shot but, you could try to reset the settings on your transmitter."
Hello everybody!I'm having some difficulties with my quadcopter.The behaviour is this: when I try to take off the drone, one motor is acceleration much more rapidly than the others and one barely spins. The other two motor are somewhere in between…