Lately my mouse has been jumping from where it is on the screen to the bottom of the screen, and occasionally to the top. every time it jumps it right clicks open the menu of where I'm at on the page. if i leave my computer for an extended period of time without logging out our placing it in sleep mode i will return to my desktop rearranged with task bar at the top still locked or windows opened that were closed before. My mouse is on a matted surface and the problem doesn't happen when my drawing tablet is connected the my PC.