The cursor on the laptop randomly moves to the bottom of the screen. When I touch the touchpad to gain control, I am able to move the cursor but it continues to move down ward. This will happen randomly for up to 10 minutes and then it stops. I have re-installed Windows 7, updated the BIOS and all the drivers including Intel, but this issue still occurs. Even when I plug in an external mouse, the issue still occurs. I have also tried disabling the touchpad. The diagnostic testing has passed. Is still a software or hardware issue?