Does anyone have an iPhone 5? I need help

So, for the past week, the Главная button won't work. It'll be unresponsive, then will go off a bunch of times without me even touching it. And Voice Control (since I turned off Siri) won't stop activating by itself. I got the button fixed yesterday and it worked for a bit but now it's doing the same thing as it was. Does anyone know the problem with it? And is there a solution?