I am also affected. 
64-bit architecture. It happens in both fresh install and upgrade to 12.04.

it can happen in different apps: Firefox, geany and others.
I am usually sent back to the login screen without any prior notice but on some 
occasions the screen freezes and only the mouse stays responsive, but of course 
those two behaviours could be unrelated.

bug#990693 could be a duplicate.

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

Title:
  Random log off in Ubuntu 12.04 LT Beta

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