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Nope have to throw it away and buy another. I've had this same problem every 3-4 months: works fine then it disappears from device manager then it works again at random. I end up replacing it after my curser stops moving for minutes at a time. After a few months the replacement does the same thing. My 5th replacement will be Kensington, Logitech apparently sucks
Most probably because your 'Touch Pad Mouse' is touched by your palm (hand or something) while you are typing. Avoid contact with the mouse touch pad while typing.
If you have a centre moveable mouse on your laptop, start using it and disable the 'Touch pad mouse'
Best of luck!