Is my Wacom Graphire4 CTE-640 graphics tablet in need of a new pen?

I have a wacom cte 640 which i have had a number of years. I hadn't used it in a month or so and when I came back to it it started acting differently. It seems to have lost calibration as it is acting as if the pen is touching the tablet even when there is up to a centimeter's gap between the two.... show more I have a wacom cte 640 which i have had a number of years. I hadn't used it in a month or so and when I came back to it it started acting differently.

It seems to have lost calibration as it is acting as if the pen is touching the tablet even when there is up to a centimeter's gap between the two.

Do I have to replace the pen and if so, how can i prevent this from happening again?
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