After updating to NIS 22.5.5.15, computer will not stay in hibernation or sleep

I am running Win 8.1.

I recently updated to NIS 22.5.5.15. 

Prior to updating, my computer had no problem staying in hibernation or in sleep mode.  Now the computer self-awakens from hibernation and sleep within 10 or 15 minutes. 

I have run the Windows Power Troubleshooter to no avail.  I have also checked all hardware devices (such as network adapters) to make sure they are set not to awaken the computer.  Also, the Windows System Event Log shows "unknown" source for the awakening event.

Is it possible that NIS is waking my computer?