Right now managed to avoid it happening again by setting the display settings again after playing (as in just go to settings, move the slider away from 1280x1024 and then back again so it'll think something changed, then hit ok). But also happened to look in system log and notice a bunch of "invalid state" errors from the display driver. Just one now, associated with when I played, so not even each time it caused the issue, but quite a long list of them while I was playing before that 2 week-break, and none during said break.

"We're all humans." Let's try to be more!
"The chief obstacle to the progress of the human race is the human race."
"If you're falling off a cliff you may as well try to fly, you've got nothing to lose."