This quadcopter was running OK for weeks.
Had a couple crashes.
Recently, had to reduce the Pitch/Roll from default 1.5 to 1.09 to reduce wobbling.
Then 1 day, 1 motor beeping and not spinning up at same time as others.
Trying to take off wild wobbling, and high throttle even when I have stick down. - > another crash.
Suspected problem with loose ESC signal/ground. Swapped motors. No more motor beeping. Soldered the signal/ground to pins on APM. Problem persists.
I tested each motor SEPERATELY with a different PWM receiver. Slowly spin up. Spin down. Seems no problem with any motor.
Here is my log:
Quad is on floor. Put low throttle. All motors spin up same time.
I moved stick left/right for roll, and then same for pitch. (to see in logs)
Held copter in hand, and throttle up very slowly over 20 sec… after about 55%, motors on one side suddenly ROAR to 100%.
Sometimes when I do this, I immediately push throttle down to 0%. Motors are still spinning 100% for 10+ sec.
I have to manually disconnect battery!