This Problem ist when i Wake up the Phone from the Stand-by with the power key on the top of the phone, it sometimes only shows a grey background with a few black lines. But the softkeys backlight work like they do when the phone wakes up and shows the lockscreen.
when i press the power button again, it goes to standby regulary and i can wake it up and it shows the lockscreen. so i need to press the power key 3 times to wake the phone. maybe someone can help and sorry for my bad english...
Edit: It's GSM with LiquidSmooth 3 KitKat, Root, S-Off and Hboot 1.49
I think its a kernel issue, with stock kernel everything is good