OP, I had a similar problem. I updated my version of Windows (to 8.1 not 10) and my monitor screen kept blacking out for a second or two and then recovering. It would do this frequently. Occasionally I would get a message saying the graphics driver had failed but had recovered.
I assumed it was a graphics driver issue so I updated and downgraded and repeatedly installed/uninstalled and reinstalled. I turned it off and on again and even tried banging it on the left hand side of the screen (always worked with the old CRT TV my Mum and Dad had when I was a kid). Nothing worked.
So, I went to manufacturer's website and they have a system update util. I used that to check and found that it thought I had a couple of things missing. One was a monitor INF file which basically told the system how to interact with my monitor. Installing that fixed the issue.
All that by way of saying that it may not actually be a Lightroom or a Graphics card issue.... it may be your GFX card having a problem interacting with your monitor.