So... I've had this problem before, where the tablet starts acting like a mouth. What I mean is, usually the tablet area is proportional to the computer screen, this means if you lift your tablet pen from the top left of your tablet and puts it directly on the bottom right, the cursor on your computer screen should jump to the bottom right of the screen. Whereas with a mouse, you can lift a mouse and put it down again anywhere and the cursor on the screen will start from wherever you left it when you lifted the mouse. Those of you who have tablets will know what I'm talking about here.
Usually the times i've previously had this error, I just unplug and replug the tablet and it would be fixed. Another error is when the pen loses sensitivity and whatever you draw on the screen will just be a big thick line that's the maximum width of the photoshop pen tool you've selected... This error is happening at the same time. This could usually be fixed by restarting photoshop mostly. I've tried both methods and none fixed any of these problems.
But then again... I've had this tablet since 6-7 years ago. It's probably the most ancient version of wacom ever.. It's a 4x5 Graphire, you can't even find used once of these being sold on ebay anymore 3 years ago due to how ancient this model is. It's served me while but maybe it's about time it gives up on me.

When I get home tonight I'm gonna try again to fix it, if I've determined that it's forever dead and unfixable I'll be browsing wacom's site for a new tablet. I'm leaning towards a medium intuos4, what do you guys think?