Disabling compiz seems to have fixed the freezing.
There might be a shorter way to do this, but this is what I've done.:

In Ubuntu Software Center find and install Compiz Fusion Icon.
Run it:
Applications -> System Tools -> Compiz Fusion Icon.
Then on the blue icon that appears, right click, go to Select Window Manager, 
and choose Metacity.

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https://bugs.launchpad.net/bugs/781402

Title:
  Ubuntu 11.04 / Unity freezing when screen is 'woken up'

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