If you use the NUMPAD to control the alierons and elavator, DO NOT FORGET to hit NUMPAD 5 to center the control surfaces. Otherwise it all stays how you put it. Like if you tap NUM 2 to raise the nose, the elavators will NOT center themselves out, ONLY NUM5 will do that.
This should hopefully help the autopilot disengage pitch problems everyone seems to have.
Chief Captain