Samsung Moment :: Way To Disable Joystick?

I've had the Moment for about 1 1/2 months. At times, it seems as though the joystick is "stuck" - it moves the cursor all around (sort of like the center mouse on a laptop). Sometimes it will move around the screen, move from one screen to another, move the cursor when typing, etc... It makes the phone unusable. I've looked in a bunch of forums and haven't seen anyone else complain. I normally have to remove the battery and boot it back up and everything starts to work again. I had a zag on it, but removed it thinking it might be the problem (it wasn't). The Sprint store was zero help (it didn't happen while there). Is there a way to disable the joystick? I'm tempted to just take the phone apart and remove it.