21.5" iMac shuts down unexpectedly.  How do I fix this?

My iMac (Aug 2010 purchase) shuts down unexpectedly when I put it to sleep occasionally.

Set the Screen Saver Preference to Never.
Set the Computer Sleep to Never, the display to 5 or 10 min. and uncheck all the boxes.
Check to be sure that Sleep or Shutdown are not Scheduled.
Reset the SMC > http://support.apple.com/kb/HT3964
1. Shut down the computer.
2. Unplug the computer's power cord.
3. Press and hold the power button for 5 seconds.
4. Release the power button.
5. Attach the computers power cable.
6. Press the power button to turn on the computer.
Then test the computer for a few days, only sleeping it from the drop down menu when your done at the end of the day.
Dennis

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