[bongodriver]

Theres been various issues with the g940 but now I have mine working perfectly I love it, it could be you are having the famous 'spiking' issue which tended to effect the rudder less than the throttle rotary dials but on mine it certainly caused rudder problems, unfortunately it requires taking the unit appart....check the web and you should find various solutions, alternatively check the logitech wingman team website and download a couple of the utils there, one I found usefull was the calibration clearing tool.