I had my Galaxy S7 Edge for about 4 or 5 months and had no problems until two days ago. I woke up and checked my phone and saw 4 horizontal gray lines that went across my phone. Whenever I change the brightness of my phone, the lines either gets bigger or smaller. I don't recall doing anything to my phone like dropping it or getting water on it as I'm extremely careful with this phone. Is there anyway to fix this problem? Thank you.