yea, its something i've been experiencing myself lately. another cyber (owl) has had the same problems.
It seems that yanking the wheel to one direction causes it to go out of calibration if it isnt yanked back at the same speed / distance. Ok "yanking" sounds harsh, but i dont mean it in a very violent way; just basic correcting of oversteer etc.
I've installed all the patches available at the wingman site, tried every kind of re/de-calibration and its still the same. I cant remember when this problem started, but i can say 100% sure it wasnt like this before christmas....hmm year 2006 bug??
I havent tried installing the latest drivers yet, but on the wingmanteam site it says that there is NO update to previous devices in the latest drivers...only for some joypad stuff and upgrading is "pointless". Guess i'll try that since there's nothing else i can do..