My wife's Dell laptop had freezes as well. I believe hers was solved by uninstalling or disabling gnome-screensaver. She finds that if she never closes the laptop lid, it rarely if ever locks up. I also uninstalled gnome-screensaver on my laptop, since my "forced logouts" almost always came when it was time to unlock after a long absence. So I offer that as another place to look for people having problems.
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