Wacom Intuous 2 stylus continues action after lifting

After years of using my Wacom pen with an Intuos 2 tablet, the pen is suddenly acting strange. When I lift the pen from the tablet, the action continues. If I am drawing with the brush in Photoshop, it leaves thin lines in the direction of the lift. If I am moving a picture box in Adobe InDesign, the box shifts as I lift the pen. If I am moving the slider on a window, it shifts further as I lift the pen. At the same time, it is suddenly requiring more pressure to select a different window among the many open on my screen, or to perform other tasks. I tried making changes on the Wacom utility, to no avail. Taking the pen apart and putting it back together didn't help either. As I do a lot of drawing with the pen, this is not productive. Any suggestions would be appreciated.