Thanks for help knc1 and Cinisajoy, I updated my PW to 5.6.1.1, with official package from Amazon, and what you know; it doesn't restart when fast pressing power button, so it might have been software or software+hardware bug. For some reason I just didn't though about updating back after JB.
As to CM I ended up switching to LibrarianSync, too bad it doesn't support nested collections, but I don't want playing with reinstalling software anymore and it works now.
Quote:
Originally Posted by Cinisajoy
A change of cover might help with the frontlight problem.
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As long as just cycling through power states fixes it I don't really mind, especially since I fixed the reboots. It may also be hardware problem with my PW, like latching reed switch (don't know if Kindle uses reed switches or hall sensors).