From what I have seen, the problems that cause the device to restart don't tend produce a trace log. The crash and restart happen in such a way that the log can't be written.
What's the problem you are seeing? It should fall into one of two types. Either an immediate restart, or a hang followed by a restart after some time. I can't think of he last time I saw the first for a book. The last one I do remember was for some Pocket articles. This was fixed in 4.6.9960.
The other type is triggered by sickel. It is a process monitor and will restart the device if it sees that a process is no longer responding. The last one of these I can think of was is a problem with kepubs with a lot of chapters. This seems to have been fixed with 4.6.9960 as I haven't been able to reproduce it recently.
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