Hold SHIFT as you click Shutdown. This will achieve a full shutdown (instead of a hybrid) to test SteveMat's theory that the user will be logged off. If it works, then make it permanent this way...
(1) R-Clk the battery in the Tray, & select "Power Options".
(2) Click "Choose what the power buttons do" at top left.
(3) Click "Change settings that are currently unavailable" at top.
(4) Uncheck "Turn on fast startup (recommended)" at bottom.
After that, SHIFT is no longer required for a full shutdown. However, I have come to like fast startup; so, turn it back ON, if OFF is no cure. And sit patiently for Microsoft to fix it.
Edit: You will still be able to hibernate with fast startup OFF. Only the behavior of shutdown is changed.