Why is my phones home button going off at random times

Recently I got a lifeproof for 70$ off of their site. I decided to use it in Mexico, but after about a minute in the pool, water got into it. I took it out and let it air dry. After about an hour of airdrying I decided to check it out. Everything was good except the home button didn't work. I put it in rice, let it dried, turned my home button and all the other home button fixes. None of them worked, but after a night sitting around it worked! I got happy and decided to use it just to realize that the home button would go off into Siri, the list of open apps, go home, and take screenshots sometimes when I pressed the power button. I am not near an Apple Store or any repair store. I need help to fix this problem with my phone. How do get rid of these random presses?