Random freezes in Ubuntu 11.10

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http://askubuntu.com – I have read every single post about system freezes, but cannot find my exact problem. Basically, Ubuntu 11.10 is randomly freezing. When it happens, I cannot do anything, not even move the mouse. Everything is locked up, even the keyboard is not responding (num lock does nothing). I noticed that the CPU fan starts to spin faster when the system freezes, but I verified that the CPU temp is OK just a moment before the freeze, so it's not that. My system was working OK one week ago, after using it for more than two months. Now, suddenly, I started getting this problem, it happens several time (HowTos)