Hi!

> >>>>> Does it lock up for you? [Hmm. And this boot is stable. So it does not
> >>>>> always lock up..]
> >>>>
> >>>> So it crashed 5 times in a row, and then it keeps working... and
> >>>> working...
> >>
> >> Maybe low battery and it kept powering off?
> >
> > No. It happened three times today... once battery was almost full.
> >
> > It is strange; twice so far it seemed it has effect over the
> > reboot. As in Kexecboot showed up, I attempted to use arrow keys, no
> > response, then it rebooted once more, and kexecboot worked that time.
>
> Did you always have wifi on / enabled?
>
> If it is a wifi pm problem, then perhaps keeping wifi off could give us
> more confidence this is the case. I am not sure if I have seen it happen
> on devices where wifi interface was disabled. But perhaps it's a red
> herring.

I did... (And wifi is not too reliable for me).

But it seems there's better candidate: when I use "wrong" cable for
charging, green LED starts blinking very rapidly, and then system
seems to be sad/broken.

Best regards,
                                    Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html