Lukas, I went into system settings > Advanced >Power Management > Edit
Profiles and chose the Performance profile (since my ac adapter is
usually plugged in). I unchecked the "Suspend after" and "Power off
after" selections under the Screen tab for my profile. I think the
problem comes when the system attempts to Suspend. So far, even though
my screen has gone black when I've left the system alone, I haven't had
that hard freeze (knocks on wood).

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Lenovo Thinkpad x100e System freeze during X start-up and while X is running, 
but only on battery.
https://bugs.launchpad.net/bugs/535653
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