I am running Windows 10 on a Lenovo T440s laptop, which I use as my primary computer. The computer remains plugged in and on unless I periodically turn it off for updates or travel. A couple of weeks ago the computer started rebooting at unexpected times. I am never there when it happens, so I suspect it's tied to inactivity. It is not the reboot that comes with occasional Windows updates, sometimes happening 2-3 times a day. But I don't know what setting I can change to make it stop and remain on. Please help.