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Logitech Unifying Receiver
Just a minor contribution here. After buying a Logitech keyboard/mouse combo, I was having problems with the mouse continually stopping. The cursor would simply freeze. Many threads on other sites, including Logitech, contained various fixes but none that worked. After a couple of days of exploring ineffective recommendations, I looked at the driver settings.
The issue is not with the drivers for the keyboard/mouse, you need to go into the Control Panel>Hardware and Sound>Device Manager>Human Interface Devices> and look for any entries for Logitech. There may be more than one. For each entry, click properties and in the power management tab, deselect the "allow computer to turn device off to save power". Once I did this my mouse started working flawlessly.