[ubuntu] Brand new netbook, random freeze in Ubuntu, no problems in Windows 7

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http://ubuntuforums.org – I have here this brand new Lenovo Thinkpad X1 Carbon and it came with Windows 7 preinstalled. For dual booting purposes I installed Ubuntu 12.04 LTS, and while configuring the system, I noticed it totally freezes at random, sometimes after 15 minutes, sometimes after an hour. By totally, I mean the screen freezes, the hard drive indicator doesn't flicker anymore, magic keys such as Ctrl+Alt+F2 don't work, and System Requests like SysRq+B(oot) do nothing. I can find nothing suspicious in the logs, but I have to admit that I am not sure what I am looking for. All this, but in Windows (Hardware)