Have you done a shutdown, power off (disconnect from wall) and reboot?
Well of course you think you have but MS have actually made this pretty difficult.
Turn off Fast Startup then shutdown and power up the computer. Leave fast startup off. If you want hibernate then enable it in the power menu.This is the only way to do a hardware reset (power off) and a full system restart at the same time. Fast Startup is the devils work.
If still broken. Check drivers for yellow/red flags in Device Manager.
If that's OK check the OS files for integrity as follows.
Administrator Command window
chkdsk /f
If clean
sfc /scannow
repeat until clean (usually once is enough but occasionally needs repeated) or if it says it cant fix it
dism /online /cleanup-image /restorehealth
If that says it has fixed it then finally repeat
scf /scannow
As suggested check the Event Viewer. You know exactly when these events are occurring so it should be easy enough to isolate any anomalies.
Windows Logs/System is the main one and may as well check
Windows Logs/Applications
Every computer I look at has vary scary looking and incomprehensible messages in the log so don't panic.