Even while parked on a ramp my 3D cockpit view moves around under the mouse cursor, as if it were floating. The speed indicator moves up and down also, as if there were turbulence. This happens with different planes, even when ATIS states there is very little wind. It's almost impossible to use the mouse to adjust settings because of this spurious movement. I have unplugged the mouse, yoke, pedals and the problem persists, so it's not likely a problem with one of these devices. I have calibrated everything, did not fix. I've check every setting I can find, and don't see anything that might address this.