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My iMac (2014) running OS X 10.11.3 goes to sleep every now and then several times a day while I am using it.

I do not lose any work, but it is very annoying. I do not have any hot-corners for sleep, or Energy Saver settings that cause the behavior.

After monitoring my machine using Terminal:

pmset -g pslo
2016-03-08 17:52:48 -0600 IORegisterForSystemPower: ...Sleeping...

When the event happens, I checked out the logs:

Console.app > System Log Queries > All Messages

3/8/16 5:52:48.206 PM CommCenter[299]: Telling CSI to go low power.

Why is CommCenter telling CSI to go to low power while I am actively using my iMac?

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Well, that did not work. Now I'm going to try this in Terminal.app for 5 hours of "don't go to sleep on me":

caffeinate -t 18000

Info on that command is:

man caffeinate
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  • Can you please edit your own question outlining what you have tried, and only if it works, you can answer your question.
    – At0mic
    Apr 6 '16 at 23:17
  • @IronCraftMan • Ultimately, I did not figure out how to fix the spontaneous sleep behavior. I ended up buying a new machine, and reformatting the old machine. Now the old machine, having been mowed over, reformatted, and the OS reinstalled fresh, it no longer has the sleep behavior.
    – Eljay
    Nov 8 '18 at 17:44
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I did this to stop the CommCenter:

launchctl remove com.apple.CommCenter

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