Bottom part of my iphone touch screen won't respond?

I got my screen replaced by a friend and it has not had any problems but I feel like something happened when I was swimming with it in my lifeproof case. There isn't water damage and the warranty does not cover it if it was replaced by non apple store. What could be the problem? Can i fix it myself?

Maybe you have gotten a "dead spot" on your screen that happens from iPhone to iPhone i recommend popping on a new lcd screen or i would recommend taking a micro-fibre cloth and cleaning the specific area with it in circular motion.

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