Thanks for sharing the information. Hmm it's strange that you have to re-do the calibration, you really shouldn't have to do that if you got it right once. In case it looses the calibration or there is some strange behavior like not all axis are working, it's usually some conflict with another USB device. If you have more than one input device connected at the same time (another joystick, drawing tablet etc..) that can cause a conflict.
(It might also be a problem with the USB driver. For example if you have installed vJoy/Smartpropoplus or similar software, that might cause a conflict with the USB driver).