Cursor focusing changing randomly

#1
With my windows 7 laptop, I have a weird problem where the cursor focus changes randomly. This is not very often but still i would experience it now and then. If I miss focusing on the screen, I would see i have made a mess of what I have already written. I normally start typing only when the page stops loading. This happens on small pages with just login fields like gmail login. Any suggestions here?
 


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