At work I use a Dell, with a dell optical mouse. Sometimes when I'm using it, the mouse will randomly jump to the corner of the screen, and I will lose it for a second or so. It's not a problem, just a wicked nuisance. It's does it sometimes, sometimes not. It just happened like twice in the past minute, so thats why I asked. Think it's just a cheap mouse? Maybe has something to do with the mouse pad and darker and lighter areas of it?