I made another discovery just now while fiddling around with the constant crashes. Koreader didn't have any problems with these problematic images not because it's better than the built in PB Reader, but because it doesn't support color. It turns out that if I use PB Reader and set the color setting to -10 to make the entire screen monochrome, the problems disappear and I'm able to go through the images without crashing.
In other words, the crash happens specifically when trying to display certain images with color and in large size. I hope this helps narrow down the problem, but I don't know how to solve it or whether this is a software or hardware problem.
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