Most likely the power supply. The power supply in the iMac has a known overheating issue. When the computer reaches a certain temperature, it will shut itself off. During sleep, the powersupply is still providing power, but the fans are not running to cool it down. The defect in the unit causes it to get hot, thus setting off the thermal sensors which cause the system to abort (i.e. shut down). If your iMac starts to smell like burning rubber, power it off NOW! Anyway, it's covered under warranty. Take it to an Apple Specialist, NOT the Apple Store, and check it in.
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