This is a zenfone 2 right? if so, I need more info:
Q: When did you purchase this (recently I guess?)
Q: did you update its OS from the stock OS it originally came from?
If the answer to those 2 questions are YESes.. then you are in "luck" the issue is gonna get worse... LCD is dying due to some sort of firmware and OS incompatibility that exist with the older LCD ASUS used for the model ZE551ML.
If the answer is no, then Im wrong and I need more clues :)