I had to reset mine too. Tt stopped responding to any of the buttons, including the on/off button. There were three different crashes, quite close together, but there's been no problem in the week since then, and I'd had it for a couple of weeks with no problems before that, so it's at a level I can live with.
The thing that's a bit of an irritation in normal use is that I can't look up the last word in a paragraph in the dictionary. It selects the first word of the following paragraph as well, and if I try to drag the endpoint of the selection back to include just the word I want, it closes the book (without remembering which page I'm up to) and flashes back to the home screen. I'm reading some French books, so I'm using the dictionary a lot more often than I would for an English book.
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