Mac Pro :: Sleep Mode Is Not Working Properly

Jul 2, 2014

After Mavericks Update 10.9.4 sleep mode are not working properly.My Mac Pro goes to sleep but after a amount of time (sometimes minutes, sometimes seconds)the Mac awakes with black screen (monitors in sleep, the mac not). Pressing mouse or keyboard button awakes my monitors. Previews of 10.9.4 nor in earlier releases..Reseting the NVRAM/PRAM doesn't solve my problems. 

My System: 

MacPro5,1
Xenon 3.00 GHz Quad-Core
48GB DDR3 ECC RAM (4x 16GB)
Apple GeForce GT120 512MB (Slot 1) with Monitor #2 on HDMI
EVGA GeForce GTX580 Classified 3GB (Slot 2) with Monitor #1 on HDMI (plus extra internal PSU in DVD-Tray)
AirPort Extreme incl. BT
Mighty Mouse USB + Magic Mouse BT + Alu Keyboard USB
OS X Mavericks 10.9.4 

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