F14 Branched -- hard freezes

[Martin Sourada]

Hi all,

I've been encountering a strange issue I have no idea how to handle --
my laptop hard freezes about an half an hour after boot, irrespective of
what am I doing (first I was doing something in midori, second I was
listening to some song in rhythmbox, third I wasn't even present).
Screen freezes, one cannot ping the machine, sound, if any is playing at
the time of freeze, plays an infinite loop.

Strange thing is, when I was home it didn't froze for 3 straight days.
It does not freeze on F12 either. The only difference is that at the
place where it freezes I also have external USB HDD, USB keyboard and
USB wireless mouse connected and use wired connection instead of
wireless.

Anyone one having similar issues? Any idea how to debug this? How to
produce some usable info in order to fill a bug?

Thanks,
Martin