Ubuntu 12. 04 randomly freezing [closed]

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http://askubuntu.com – My Ubuntu 12.04 LTS Laptop is freezing randomly driving me crazy. Fist the problem was generated while I surf the web in Chromium-Browser, I switched to Chrome but nothing, I find in internet that Chrome was doing some hardware acceleration that crashed Mac OS, Windows and Linux... so now I'm using Firefox. The problem go away until I started to use eclipse. the laptop model is Samsung NP350V4C-A04MX There are 7.9G of swap turned on as it tells lsblk, and 4GB of Memory. first the mouse-cursor stops following mousepad gestures, the screen freezes and then I can do absolutly nothing than a h (HowTos)