Major problem :(

Lastnight I was flying around and without warning, my aircraft started banking to the right by itself. I calibrated my joystick, reset all asignments and sensetivities and it's still doing it. It's happened a couple times already, but previously all i had to do was create a new flight and it was ok, now it doesn't help. I create a new flight; aircraft, time and place all default and when I slew, the aircraft spins to the right very fast.
please help me
please help me
