@vedran136.
I experienced something similar and in my case the controllers were to blame. I use a Thrustmaster T16000M joystick and Throttle including pedals.
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When fiddling with the settings save them under a descriptive name. This way you can have a tailor-made setup for each aircraft and that makes life easier. The Airbus is hardly flyable with the same setup as the Cessna 152.
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Adjust the dead zone for all spring loaded input devices (stick and hat switches). Default is 1%, but you may need 2-4% to stop it interfering with the aircraft. I had a problem with the camera constantly creeping downwards, until I changed the dead zone to 2%. Same cure for the pedals.
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On other devices (throttle lever and elevator trim) set the dead zone to 0% as there is no mechanical midpoint. It is just a simple potentiometer.
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When beginning a new flight, syncronize your controllers!
The sim and the controllers are not in sync, and this goes specifically for the elevator trim. Move them up and down, left and right and leave them in neutral position. Do not forget rudder and aileron trim. Default aileron trim for the TBM930 is -0.2 forcing the aircraft to immediately bank right. I use 0.0.
When airborne - and before activating the auto pilot - trim your aircraft for a straight flight path. This will prevent the unexpected to happen when you later disengage the auto pilot for landing.
Remember, the auto pilot does NOT adjust the trim controls - you do!