Please read or skim as we worked the usual but later it dawned on me to take aim at the OS. Turns out it wasn't from a Microsoft source.

If nothing rings a bell there, let's start with your Speccy report and see if that shows any more clues. And yes, I will be checking your BIOS is current. If you feel otherwise then you MUST have the motherboard maker tell you that. ME? Not negotiable as I work these by the handfuls each month. It's a process that has worked well for us.