Scrreen scrolls without input when using microsoft office

When I'm using microsoft excel or powerpoint, frequently as I am editing, the screen will scroll to a different random location. So in excel, I will suddenly be looking at a different location in the spreadsheet or in ppt, I'd be on a different slide. this happens consistently (but not reproducible) every time I use excel and ppt. And I am NOT using the mouse to intentionally scroll using double-finger etc.. There is no problem I'm using other applications. Anyone else experiencing this problem? Remedies?

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                             [click on image to enlarge]
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    It's recommended to download and install
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    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
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