Why does  the iMac quit after 90 minuets when listening to iTunes on Apple TV

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I have this same issue, even after new iTunes (12.01.26) and upgrading to Yosemite – iTunes plays nicely for about an hour, then stops and the iMac reverts to the log-in page. Under Energy Saver, Computer Sleep (Never) and Display Sleep (1HR). I have changed the last setting to different times but no joy. Does anyone have a good suggestion for this anomaly?
Found this text in the help file:
Prevent computer from sleeping automatically when the display is off
Select this option if you want your display to sleep and your computer to stay awake.
HOWEVER, this option does not show up under the Energy Saver on my iMac (27in. Mid-2011)
Anyone?

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