Was it f-secure?
I don't know why the error was corrected, but I will explain what the error was. For a long time, my computer has not always been able to turn off completely every time. It turns off until the light in the power button comes back on, and I can't do anything but hold the power button until the machine dies.
I have f-secure installed on the machine. I have reinstalled win10 2 times but it did not fix the error. Then what I could never imagine happens, I uninstalled f-secure and install Norton 360 Deluxe and thus the error was gone. I don't yet know what the reason is, but I can only state that the error must be due to f-secure. Hope someone has experienced this and can explain what happened.