Thanks everyone for your ideas. I thought it might have been overheating as well, but I never felt it hot or even warm to the touch, and the screen glitch happened nonetheless. I have used it in the sun, but nothing that I would consider extreme temperatures.
Also thought about the sleep cover, disabled the recognition function in the software, still the same issue. I wonder if maybe the magnet in the cover might be causing this somehow, I might take it off... Oh, and the wifi is always off, I don't care for it, just sync with Calibre over USB.
My next bet would be to open it and try reseating all the cables. I'll have to find a torx screwdriver that's tiny enough. Right now I'm waiting for the screen to just reset itself to blank (the battery is completely dry for over a week but the screen is still showing the upper-third fixed image, I guess e-ink does indeed retain position for a long time). I might try turning the logging on when I charge it again. Never used it, though, so any instructions on this?
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