My P3A has been running awesome for a couple of months. No crashes, no issues. BUT, these last few flights if I give it hard acceleration, it will go completely unstable for a few seconds (dips hard, off track, loses altitude). There is also a substantial change in the noise from the blades. It acts like one of the motors is crapping out and the others are trying to stabilize it. I have tried a second set of blades, but does the same thing. If I fly calm and cool, no noticeable issues. But if I give it full up and forward throttle it goes nuts. I have to release the controls and then after a couple of seconds it will stabilize. I have to give a little input to keep it elevated. It is making me nervous that a motor is going bad and one of these times it will not recover. Any suggestions? Is there a way to test the motors individually? Thank you.