Hmm… my new desktop seems to have a new issue now the old SSD one was sorted. Sometimes, and it may be getting more frequent (up to daily), the screen goes blank for a bit. It may happen a few times in short succession before a longer blackout. When it comes back, I get a popup from the driver saying something has stopped responding and it has automatically recovered.
I’m going to try swapping the 560 for my old 450 and see if that helps. At least that could indicate if it’s the gfx or elsewhere.