Certainly some books can crash the reader, but it's unusual to be one that's converted from txt to lrf, so if it's repeatable, Kovid might well be interested in the details.
As an aside, sometimes a book can cause a crash then work after the restart (suggesting there's a memory issue somewhere), but two things you could try are either using the Sony software to transfer the book to the device, or to try converting to ePub rather than lrf.
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