Ok, will check the BIOS.
Yes, have run scannow but I could not generate the .txt file on my desktop. Maybe that indicates an issue. You can find that task in the first few pages of this thread. I need to research the SSD firmware.
Initially, a couple of months ago, I did a clean install of Windows 10. Just yesterday, I ran a repair install based on suggestions in this thread. So that's what we are working on. I have an Image from before that was done that I could reinstall.
I've rebooted. I'll have more to post soon.