I upgraded to OSX 10.9.4 and now my iMac will randomly reboot during the day even with apps left open in the background

I upgraded to 10.9.4.
Apps are running in the background,
For some reason when unattended, it will just reboot and go to the login screen (shutting all apps down.)
Powersaver features are not set to shut down.
I reset the NVRAM.
Any ideas?  This is REALLY getting annoying at this point.

From the menu bar, select
           ▹ System Preferences... ▹ Security & Privacy
If there's a closed padlock icon in the lower left corner of the preference pane, click it and enter your login password when prompted.
Click the Advanced button and, in the sheet that opens, uncheck the box marked
          Log out after … minutes of inactivity

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