Is this while running on A/C or on battery?
Can you try the following? In gconf-editor, set
apps->gnome-power-manager->use_profile_time to FALSE (unchecked).
If that fixes it, then this is related to bug 120258
** Changed in: gnome-power-manager (Ubuntu)
Status: Unconfirmed => Needs Info
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Computer hibernates after 1 hour of inactivity
https://bugs.launchpad.net/bugs/114523
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