Hmm. It just occurred to me that I hadn't tried hard-resetting it. So I just have, and the problem's gone away. (For now, anyway.)
Maybe it was just a glitch. (Though why it should kick in when the device wasn't actually doing anything, I have no idea. And I'm surprised by the icons for the books on the SD card. They'd never been there before, and now they are, even after the resetting. I gather they're intended?)
Anyway, I've left all this here in case anyone has any comments or suggestions to make.
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