Trouble with iphone 5s home button?

Question

iPhone

Help out guys. The iphone 5s phone has a working home button 5s, but the problem is that sometimes it stops working and I found only one way out, this is to hit the back of the case near the home button and it starts working again.
The essence of the question: how to fix this miracle and not resort to such drastic measures by punching the back cover of the phone?
what is the principle of this button?
Can the lack of two strong display screws cause this problem?

Answer 1

Go to service