I received my APM 2.0 a couple of months ago. On my maiden flight, I was having some trouble flying in stabilize mode. I switched back to manual, and the plane promptly went belly up and straight into the ground. I built a new airframe and began testing some things the other day. I found that, while in stabilize mode, the whole system will lock up for 2-3 seconds when I manually activate the control surfaces. Sometimes, when I put it back in manual mode, the left aileron will shoot straight up. I believe this is what caused my initial crash. Has anyone experienced this sort of problem, and was there a solution? I am a little concerned about putting it back in the air with it doing this on the ground.