Just wanted to report that the problem surfaced again and I had to suspend igfxFM.exe. I eventually rebooted and all's well for now.
I also need to report that I was incorrect about my system not having hibernate enabled. I recently noticed that hibernate was enabled. That must have happened when I changed power plans. I did turn it off in the active power plan and disabled it within Windows (the hiberfile is gone) ... but I now need to go back into my saved powers plans to ensure that hibernate is off in each plan (just in case I ever decide to use that plan again).
It seems that this program ... igfxFM.exe ... is being called the graphics driver, but it's not the actual name of the graphics driver program.
What is the purpose of this program?
Is it part of some optional software that we may be able to disable until the actual problem is resolved??
Bob