[ubuntu] Suspend stops working after som time

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http://ubuntuforums.org – Hello. I'm using Ubuntu 12.04 and it works perfectly except when i suspend the computer. If I return from suspended within a small amount of time say an hour it works just it is supposed to goes back to Ubuntu. But if i wait longer than an hour the power led just blinks once and the computer turns off. I also have to press the power-button twice after this to be able to turn the computer on. I'm dual-booting with Windows 8 and they are on different hard-drives. I have a swap space at 1GB on the same hard-drive as Ubuntu. My motherboard is: Asus SABERTOOTH P67 Does anyone know what the probl (Hardware)