I have no hacks, but have a K3 w/3G (US). Since the latest firmware update, my K3 randomly reboots (when first switched on, sometimes, often when just lying around - the pattern seems related to it doing a sync w/ Amazon).
I'm starting to think it is trying to download and run an update or that the previous update didn't clean up completely and after the end of a sync, it thinks it needs to reboot.
For those who are curious: doesn't matter if it is in a cover (lighted) or not, on the charger or not (but, if rebooting all night, it doesn't every finish a charge, so wifi has to be left off to charge fully), being read or not (has happened in the middle of reading and when lying on the table with the screensaver visible).
If wifi is off, it never reboots on it's own.
So far, suggestions from Amazon: delete some stuff, don't subscribe to "so many" items (I removed a few old NYT issues and some duplicate content, but there were only a couple dozen other items there, some via Calibre and others via Amazon). There was well over a 100 MB free and now is over 500, but the behavior hasn't changed.
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