my pc mouse..?

Q: sometimes when i move my mouse it makes my pc screen move up & down really fast so i can't read anything any one know what's wrong with it? Thanks in advance x

A: Does your mouse have an automatic scroll button between the left and right buttons? If so, if you press on this scroll button, you'll notice a circle with vertical arrows appear on the screen. This allows you to scroll without pressing buttons, but by moving your mouse. So the faster you move your mouse, the faster the window will scroll.

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