Amazon removed books from my Kindle

[CamilleScholtz]

A quick summary of the thread from what I gather, correct me if I'm wrong: AZW3 and KFX books that are marked with EBOK rather than PDOC get removed after a device comes online after having been offline for an extended amount of time.

Does anyone actually know what this timeframe is? Days? Weeks?

Also I saw someone ask if there are any differences between EBOK and PDOC, for me the reason to use EBOK is because generated x-ray files (using calibre's WordDumb plugin) only work with EBOK.

[Sirtel]

Originally Posted by CamilleScholtz

Does anyone actually know what this timeframe is? Days? Weeks?

Weeks, it looks like. No one knows exactly.

[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.

[DNSB]

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.

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.