Spitfire tail behaviour

[oFlyingDutchman]

There's something going on with the spits, as i posted earlier. Videos can be checked in the initial post since i dont have any. The aircraft controls become very strange, almost like there's lag between my input and what the aircraft recieves. Doesn't matter how small your controls are, it keeps putting the nose up and down and going into a spin. The autopilot also has a very hard time keeping it level, going up and down. It's a strange behaviour and with my limited english, quite hard to really explain. Further info can be sent

exemple: