Took the P2 out the other day and it was acting really strange. On takeoff it wanted to topple over and while flying I had to compensate with the controls to keep it from swerving into obstacles until I was able to grab it for a landing. While it is swerving it sounds like it is sputtering and struggling. At first I considered that one of the motors needs replacement as I had one motor that looked like it was sticking but now all are turning. Then I considered that maybe the controller needed recalibrating but after recalibration and another flight I get the same issue, just without wanting to topple at takeoff. Reading through the forums it seems that the ESC can be damaged if the props encounter resistance, which mine did because I did topple it over on landing about 2 weeks ago. The question I have now is what I need to do to diagnose which motor(s) or ESC(s) might be bad so I can get them replaced. Any help is appreciated.