I have Windows 7P64 & a Logitech M570 Wireless Trackball Mouse. About once a day for weeks now the mouse stops responding. Sometimes I hear the system sound of a USB being uninstalled/installed. When the mouse isn't responding & I hear that sound after a minute or so the mouse immediately starts working again. So I'm convinced the USB driver for the unifying receiver (USB dongle) keeps getting uninstalled. Like I said sometimes it'll reinstall itself other times I have to reboot the PC. How can I stop this from happening? Edit: Found out I had a second M570 listed in the Unifying Software GUI. Deleted it. Hopefully that fixed it. I'll update.