I've had a fly walk across the screen enough to turn the page. The infrared is around the entire screen, so any obstruction at all is sensitive enough to do it.
Are you just leaving your reader turned on when done rather than shutting it off? I never do that with my reader, mostly to conserve the battery. Just a quick flip of the top switch to the right puts it to sleep. It's not a total off so when you turn it back on, it's very quick to reload your book and page.
If anything at all will rest on the screen, no matter how small or lightweight, it will flip the pages to the end.
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