Been using my Logitech (with Options +) M720 on my MS Surface 6 (with Logitech USB dongle inserted) for quite a while without any problems. However, lately, the mouse was not functioning (battery check was OK); that is, the mouse just wasn't On and, of course, no cursor was present when the computer opened. I've done some research on this issue. Couldn't find an explanation, but did find a temporary "solution." Had to take the battery out and remove the dongle for 5+ seconds, then replace the battery, put in the dongle back in, and all was working. As the mouse would sometimes work and other times not, I'd appreciate, if possible, a permanent solution. Thanks.