Question: Problem with iPhone 7 screen
So I have a problem with my iPhone 7 screen. It´s began looking like this: hqdefault.jpg
But only on the bottom half. It´s not always like this, but sometimes it comes up. When I try to screenshot or record it doesn't show up, and my screen looks normal. I haven't lost my phone recently, and it was okay yesterday.
I bought my phone in the end of August 2017. I have the newest update on it too.
Anyone know what the problem is? What I should do?
iPhone 7, iOS 11.2.5