X is most likely crashing, and those are either xserver or driver bugs.
Could you please provide the output of lspci -vvnn (two v's, not a w)
and, after the crash, attach copies of your /var/log/Xorg.0.log and
/var/log/Xorg.0.log.old files please? Thanks in advance.
** Package changed: kdebase-workspace (Ubuntu) => xserver-xorg-video-
intel (Ubuntu)
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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kde4.2 kills session and shows kdm login screen on playing videos in vlc or
dragon player
https://bugs.launchpad.net/bugs/366941
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