The only time I have had to do a reset on my Kindle 1 was when I let the battery run almost all the way down and then added a couple of books to it. It went crazy trying to organize and index and apparently crashed in the middle of something important. Now, I'm always careful to put the Kindle onto the mains power before I transfer books to it -- and then leave it plugged in for an hour or so to give it time to finish the indexing without it having to draw down the battery.
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