Looks like the best advice is to shut down at the end of the day, Windows does like to reboot every so often. There is the issue about switching off mains power as well as clicking on "Shut Down" at the menu.  The PC does not switch on when power is restored, it needs the front panel switch to also be pressed, so there is the suggestion not to turn mains off but to leave the PC always connected to the power.  If so, mains power should be delivered via a surge protector or similar to safeguard unattended connection.  All good.
Is the current recommendation to leave the PC powered up, or to turn it off at the end of the day, please?
Power