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Have you dropped something on your keyboard recently? Like a drink? If you have, it might have caused some of the keys to think differently, for example, the A might think it's a D. I had that once before - I dropped a drink on my keyboard and the backspace started thinking it was an H, and the H started thinking it was the backspace. :P
If you have spilled something on your keyboard, best to put it upside down over a sink to dry for a few hours. You might need a spare keyboard handy.
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