Quote:
Originally Posted by slm
Some of the speculation was that this happens when the kindle's clock is too far out of sync with the network clock. A Kindle with the wifi on updates its time from the network regularly. A Kindle with the wifi off, relies on the internal timekeeping chip. This tend to drift slowly, but the drift is not very predictable, which would be consistent with the observations that the time is not very predictable.
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Not totally certain but back when this was still a big issue, I tried taking my Kindle offline, setting the clock about 26 hours ahead and then turning WiFi back on. No effect. The time that I left it in Airplane mode for 5 weeks, the time had drifted by less that a minute before I turned WiFi back on and the books were removed.
I still tend to suspect that after a Kindle has been offline for an extended period, Amazon checks the books to see if any books are present that are no longer in your Amazon account, whether they be returned KU, deleted purchases or sideloaded books with an ASIN, so any books with a valid ASIN that are not present in your books are removed.