Thank you for your bug report. Can you please follow the steps outlined on the 
folllowing wikipage:
https://wiki.ubuntu.com/X/Troubleshooting/Freeze
This is help to troubleshoot that is the cause of the problem.

Also try to disable compiz and see if you are good.
Goodluck

** Changed in: ubuntu
       Status: New => Incomplete

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Gnome UI becomes unresponsive after a few minutes
https://bugs.launchpad.net/bugs/630122
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