When starting Minecraft Java Edition from launcher, the loading screen appears, switches to full screen, then when the loading bar finishes, the computer reboots entirely.  When the launcher is accessed, it requires a full login and password again (though remember me was checked).  This is reproduceable.   Minecraft Java version is  1.16.2.

The work around I have is to edit the options file to have "Fullscreen: False" to start in window mode.  Then it starts without issue.  I am able to change the in-game options back to full screen and play, but if I do not change it back before logging off, it will crash to reboot again on next attempt to play. 

I see no other conflicting programs and this problem only occurs with this game.  I have done a clean install and clean startup and the problem persists.  Event viewer shows no application errors, due to the nature of rebooting entirely.