Is there any way to prevent that happening? Last flight during climb it kept disconnecting every minute. I think due to wind shifts, only happened when plane jerked suddenly and wind changed on FMS display. My joystick is calibrated properly with quite large null zones just to make sure that's not the fault.Grzegorz Furmanski

If you can verify it is weather shifts by clearing weather (no weather) then try the registered version of FSUIPC. It has weather smoothing features that work better than anything else I've found. There's hundreds of threads here on the wind shift problem.