[Q] Screen turned off

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http://forum.xda-developers.com – Hi there, Installed Omega v15 - XXDLH6 on my GT-I9300. After a while when I'm using the phone the screen turns black in facebook app when I click on a picture. when I go from potrait to landscape it shows the transition and disappears again, Press back and I return to the timeline with working screen again. This all starts after the first time the phone turns the screen from time out. Tried cache clearing, reinstalling app, killing app end clearing RAM. The only thing working is rebooting and then it starts again after a while. Suggestions anyone? (HowTos)