iMac powering down / sleeping and Roon

I installed Roon core on a friend’s hispec iMac (i7 and 32 RAM), it works well but sit suddenly turns itself off.
I have tweaked the iMac’s energy saving settings and told the Roon software to keep its screen alive but it still periodically turns itself off.

Does anyone have any suggestions on how to keep the iMac awake and running?


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On later versions os macOS, caffeinate is built in, so I use the following command from a Terminal window:

caffeinate -d

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