IMac keeps shutting down when asleep.  Need to unplug and start again.

iMac keeps shuting down after being put sleep or going to sleep on its own.  Requires disconnecting and restart. Is there a fix?

Gary...
Try Resetting the System Management Controller (SMC)
Power:
The computer doesn't respond to the power button when pressed.
A portable Mac doesn't appear to respond properly when you close or open the lid.
The computer sleeps or shuts down unexpectedly.
The battery does not appear to be charging properly.
The MagSafe power adaptor LED doesn't appear to indicate the correct activity."

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