I have a T300 and it's plugged in via usb to my main pc. If I leave it plugged in between sessions, when I start up my pc it doesn't calibrate. It will calibrate the first time when it's plugged in but not after. I have usb mains powered hub which you have to switch on and when the wheel is plugged into that, it calibrates everytime. Should I unplug my wheel from the main pc between sessions so it calibrates everytime or is it normal for it not to calibrate if I leave it plugged in. I had a TX last year with a different pc and that would calibrate every time when it was left plugged in. Hope someone can help cheers