[reflected]

I click on calibrate joystick, and as I move it around, the little cross doesn't follow it smoothly, but it shakes violently..i.e. I move the stick frward, and it shakes to the left like hell...
What's that? Can it be fixed? If not, should I buy the same type of stick, or it is not normal after a year of hard usage? It's a Speed link black widow, and I love it btw. If I had to chose another one it would be the Saitek aviator.
So what's this thing?