I have that happens to me some times, truelove. Or the device keeps on writing even when the stylus is not on the screen.
My problem usually is caused by dust between the screen and frame. Just slide a thin piece of paper to clean it from time to time fix my problem.
If you like transcriber and have extra cash, you should try
CalliGrapher. Sweet. I just learned to use CalliGrapher's
macro to open PIE or look up a contact with input stroke. Very cool! The text replacement feature alone makes it worth while.