Amazon's non-lighted (and for a very few people, the lighted) cases for the Kindle 3 also can cause this behavior.
If you're using one of them, that's probably the cause. Amazon did pull them and will refund your money even if you're past the 30 day window, as it's a known issue, and one that often takes awhile to start happening.
(Presumably it's due to the paint on the hooks being or wearing thin, causing a short in the Kindle.)
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