mouse keeps scrolling down

Interesting problem.  There is a new computer and new mouse.  The user has a problem, where the cursor goes out of control and to the bottom of the screen.  For example, if they have excel open, then it keep scrolling down to the end of the document.

What in the world could be causing this?  Its intermittent.

This is on a desktop.
al4629740Asked:
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alienvoiceConnect With a Mentor Commented:
Have you replaced the keyboard, the down arrow could be stuck?
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pony10usCommented:
When you say brand new I am hesitant to point at the keyboard or mouse however this is usally caused by a stuck key as mentioned by alienvoice or a stuck scroll button on the mouse.

Does this happen regardless of application such as Excel or IE?
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nobusCommented:
what mouse is it? wireless, , USb, laser?
the wireless  one may interfere with a cell phone - or have low battery
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al4629740Author Commented:
sure enough, it was the keyboard
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