Hm. Do you run other software? Something's really wrong here.
For a start, if koreader crashes, it might leave some hint in the file "crash.log" as of why it crashed. It shouldn't really crash, though. However, the Kindle is a quite memory restricted environment, and at some point of document complexity, it might well crash, unfortunately.
Then it should open the documents mostly for reading. The newer versions *can* write to PDFs (and if they happen to crash in that very moment, it *might* lead to corruptions, I guess), but they will do so only for saving highlights. That said - I have no idea why Koreader should leave corrupted documents behind. It clearly shouldn't - for technical reasons. So that leads me back to my original question: is there other software running?
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