Thank you for helping. 
I have upgraded BIOS to F13 although it should only improve USB3.0 
compatibilty. Lets wait for about a month for the problem to appear.

$  sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
F13
03/21/2012

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https://bugs.launchpad.net/bugs/1265065

Title:
  Desktop freeze while drag-maximizing window

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