Thanks Randall for the registry export solution.
But I still have to remotely restart the computer.
So far, I'm not able to remotely restart it.
If I RDP to one of my local network pc (Win10 Pro) and I try a "shutdown /m \IP_ADDRESS /r /f" from within an elevated prompt, I get an "access denied".
The pc I want to restart is not joined and only have one local user.
In the previous instance of this problem, I remember coming across an error message stating something to the effect that the local user had been used to many times. I didn't copy the actual error message because I had someone on site able to perform a physical hard reboot. After the reboot, the pc seemed to be back in working condition until a few days ago.
Is it possible that the problem we're facing is more a question of how many times we open/close a RDP session? As if the RDP sessions we close remain open in the background thus preventing new ones to be opened?