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I run Windows Vista on a HP TouchSmarttx2. In the last weeks the computer goes randomly into hybrid sleep even through electricity is plugged in and battery is full. What could cause this behavior?

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An application could be doing it for you. Hell, it could be malware. – Shinrai Jun 6 '11 at 14:14

Does it happen when you are working on it or when it is not used?

If it happens when the computer is not used go to Control Panel -> Power Setting and change the standby settings to never or a longer period of time.

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It happens when I'm working and the power setting is that on Never/Never/Never/Never. – Christian Jun 6 '11 at 14:00
    
Check the windows log, it might give you a clue on what is initiating the sleep mode. Control Panel -> Administrative tools -> Event Viewer – Greg Jun 6 '11 at 16:21

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