After Gnome logon it may hangs in any moment (window scroll, app start, opening url)
If sound was playing in that moment it continuously repeats last sample (about 1 second length), but do not respond to mouse move/click or keyboard. If to let it stay in this state nothing change - sound sample still repeats and no response to input. I need to reboot it by reset button. Sometime when I press reset nothing happen then after couple of seconds computer turns off, after 1-2 sec on and then starts booting.
During first 15-20 minutes after booting it may hangs multiple times but after that it works without problems.
Tried do not logon 20 minutes after boot - do not help, it hangs anyway. Only helps logon and do nothing for awhile.
This behavior have started after F12 installation. F13 installation changed nothing, only F11 worked perfectly.