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I have an optical mouse attached to my PC, and from time to time it seems like it develops a mind of its own - the cursor won't point to where I want it to, or I'll be highlighting a whole load of text and suddenly the cursor shoots from the bottom of the screen to the top and the wrong text gets highlighted.
Why the hell is it doing that, and how do I stop it?
If it's of any relevance, and I suspect it might be, there is a picture on my mouse mat.
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