Mac Mini sleep Mode

I have been having an issue lately.
Lately my Mac Mini running Mountain Lion Server had been going to sleep lately.
Energy saver is set to never go to sleep and the screen saver is set to never come on. I checked the system log and I can't find an explanation. Can anyone help?

Get Temperature Monitor to see if it's heat related...
http://www.macupdate.com/info.php/id/12381/temperature-monitor
iStat Menus...
http://bjango.com/mac/istatmenus/
And/or iStat Pro...
http://www.islayer.com/apps/istatpro/

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