the screen goes into black and cant be used anymore i can heir the ringing of calls and i can touch the screen to hangup, after 30 to 40 mints the screen return back to work for while then the problem comes again and it goes from it self! yesterday i face the same problem and it take long time to return the screen back more than 3 hours! and the screen comes for while it come back to black and so on. even if i reboot my phone the problem not solve!
my phone is android 4.3 not rooted but unlocked bootloder.
sorry for my little English