Also in addition to Steve Goddard's post, before  the like of Gdk-Warning: 
gnome-session: Fatal IO error 11, there was this line in my log.
kernel: [21828.132603] Xorg[12291]: segfault at b4fca00
0 ip b4928e66 sp bffa8840 error 7 in nvidia_drv.so[b4850000+706000]

Hopefully that can narrow the problem down a bit.

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https://bugs.launchpad.net/bugs/980519

Title:
  Random log off in Ubuntu 12.04 LT Beta

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