Without the errors, I am mainly guessing. The things I would do are:
- Connect to calibre and see if it happens again.
- Remove the book that seemed to cause the problem and send it again.
- Use the Kobo Utilities plugin to check the database on the device. Or use an SQLite management application to do the same.
- Run calibre in debug mode and keep the log produced with the errors.
For me to debug remotely, the last one is the most useful.
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