My Mac stopped going to sleep automatically

I have OS X El Capitan 10.11.5 on a Mac Pro, and under Energy Saver I have tu of display configured to 15 minutes, and I didn't enable the Prevent computer from sleeping automatically when the display is off.

now for some reason... my computer stopped going to sleep. I go to work.. come back and displays are still on!

it used to go to sleep before... it suddenly stopped and I have no idea why.

I googled and found that with pmset -g assertions I can get more information on why my computer won't go to sleep.

this is the output:

2016-07-05 08:39:37 +0300
Assertion status system-wide:
   BackgroundTask                 0
   ApplePushServiceTask           0
   UserIsActive                   1
   PreventUserIdleDisplaySleep    1
   PreventSystemSleep             0
   ExtealMedia                  1
   PreventUserIdleSystemSleep     0
   NetworkClientActive            0
Listed by owning process:
   pid 1062(rcd): [0x000172b700091522] 00:10:09 UserIsActive named: "com.apple.rcdevent"
        Timeout will fire in 291 secs Action=TimeoutActionRelease
   pid 517(Steam Helper): [0x000000250005028d] 26:31:12 NoDisplaySleepAssertion named: "Playing video"
   pid 59(powerd): [0x0000000400080138] 26:31:44 ExtealMedia named: "com.apple.powermanagement.extealmediamounted"
Keel Assertions: 0x104=USB,MAGICWAKE
   id=503  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00400000 owner=Keyboard Hub
   id=504  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00500000 owner=Exteal USB 3.0
   id=505  level=255 0x100=MAGICWAKE mod=01/01/1970, 2:00 AM description=en2 owner=en2
   id=541  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00200000 owner=IOUSBHostDevice
   id=542  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00210000 owner=IOUSBHostDevice
   id=544  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00700000 owner=4-Port USB 3.0 Hub
   id=545  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00300000 owner=USB2.0 Hub
   id=546  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00310000 owner=USB 2.0 Hub [MTT]
   id=547  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00320000 owner=USB 2.0 Hub [MTT]
   id=548  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00330000 owner=USB 2.0 Hub [MTT]
   id=549  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00312000 owner=HD Pro Webcam C920
   id=550  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00314000 owner=WestBridge
   id=551  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00315000 owner=Launch Control XL
   id=552  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00322000 owner=USB 2.0 Hub [MTT]
   id=553  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00325000 owner=Launchpad Mini
   id=554  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00317000 owner=Launch Control
   id=555  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00336000 owner=iLok
   id=556  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00340000 owner=USB 2.0 Hub [MTT]
   id=557  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00341000 owner=eLicenser
   id=558  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00343000 owner=Razer Naga Hex
   id=559  level=255 0x4=USB mod=01/01/1970, 2:00 AM description=com.apple.usb.extealdevice.00346000 owner=USB Audio CODEC
Idle sleep preventers: IODisplayWrangler

couldn't find the cause of the problem using this output. any ideas?

thanks!

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