The software seems a little buggy so far. I've had one incident requiring a reboot. Calibre crashed transferring a book, and after ejecting, the K3 appeared to be empty. The collection names were present, but nothing else was listed, including some samples downloaded from Amazon. The files were all actually still present and correct, but it took the reboot to right things.
Oh and that USB cable. I swear the damn thing is toxic.
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