The file was a .pdf that I downloaded. It's metatags are not correct - the author field is empty and the title has contains both the author and the title. I have been reading it for the last few days (since I got the device) without incident, and only ran into trouble this once.
Since resetting, I have backed out of the book and returned to it in the same manner without any problems. Hopefully it was just a freak occurance.