[ubuntu] 12.04 Shuts down randomly

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http://ubuntuforums.org – Laptop: Linux X200 Tablet. with Ubuntu 12.04 Some times the laptop shutsdown randomly and displays the following screens:_DSC0053.jpg_DSC0052.jpg_DSC0051.jpg Did memtest. After 5 passes I see no error at all. One of the other supposition is that it is happening due to heat. I have occasionally had the laptop shutdown within minutes after it started up. I have feeling that it is happening because of sudden movements but when I test it does not seem to be so. I have no clue on what is happening. Please help. Ravikanth Attached Images _DSC0053.jpg (Hardware)