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It could be that your hand accidentally hit the touchpad while you were typing, which would have moved the cursor. I've done this a few times before, so I'm fairly certain that's what happened. The cursor won't move on its own unless someone is controlling it, and it's highly unlikely that you have a trojan or a virus that is doing that.
Is the cursor stuck or a part of the mouse like scroll?if the cursor is stuck check with a different mouse,maybe the sensor of the mouse is damaged if same check from control panel for mouse settings and from pointer motion settings adjust the slider bar.
Check the batteries. Try changing them to see if this resolves the problem.
Ensure that you have a good surface for the mouse to travel on and make sure that the receiver for the mouse hasn't fallen down the back of your desk etc as this will cause the cursor to jump around the screen.
When you start up, have to mouse on the one that freezes and then switch off that one. (turn on the one that freezes first and have the mouse set it. then once it is on boot the other one and then switch mouse.
The issue may not necessarily be with the mouse. Are you able to use the keyboard once the mouse freezes? If you not even able to use the keyboard, there is some application installed on your computer or a virus due to which the mouse freezes. If, in case, the keyboard works even though the mouse is stuck, try changing the USB port or try a different mouse.
Please revert back with any other observations.