lohpsch

mallcott has a very strong point. I couldn't agree more. We find all kinds of weird problems with FSX and most, if not all, have an explanation (sometimes the problem is between the keyboard and the chair), now an aircraft that works for a week and then starts doing crazy things, that is something new. Is the OP aware that A2A aircraft have very sophisticated simulations of all systems and going to the hangar might be required? What if the spark plugs are fauled, then the engine doesn't provide enough thrust and the autopilot tries to compensate with some crazy trimming? Some realistic approach of symptoms might lead to a solution. Pointing the finger to A2A and to one of the best aircraft available aircraft for FSX is not the way to reach any solution.

So there is maybe something wrong with your FSX (is simconnect installed and working?). Sure that someone at A2A Forum can help.

Don't give up RodTod. You may find that your $50 bucks were totally worth it. I don't have the C172 but I do have the C182, with the same Autopilot. A2A aircraft are the best there is in GA for FSX and Avionics is so well modelled that you can use the real Manuals from the real Manufacturer. In this case, get the KAP 140 Autopilot System Pilot's Manual from Bendix King. You can also download it from the A2A Forum where you will find lots of info about avionics, including tutorial videos. Cheers, PS. Just keep in mind that a 2-axis Autopilot doesn't fly the aircraft for you (doesn't have control on throttle, has a limited bank authority, etc) so, as a rule, you should have your aircraft manually set for a certain flight condition and use the Autopilot just to give you some (just some) freedom to take care of other things, or enjoy the view.