This may sound funny but just recently I ran into a similar problem with a larger book. The Sherlock Holmes Omnibus. I tried loading it in a variety of ways and it would shut off the reader or hang it. The solution was to remove the SD card I had in there. Even though originally and in several incarnations I had the LRF in the 505's internal memory the Reader would not open that book if the SD card was present. Perhaps a part of the internal RAM being used for both the info/index on the SD card and the book being opened was overflowing.
Since I don't know if you are using a MMS/SD card or not I don't know if this relates to your problem, but I thought I would mention it.
-MJ
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