Chosen Solution
So I was trying to replace my rear camera and ended up screwing the home button. I bought another and after replacing it it works for a day and then I have to press really hard for it to register a click. I open it lift up the two golden prongs that stick up and it works again for a day or so going back to hard presses. Is there a part I can replace or a fix anyone found for those pesky prongs? Which I think are my problem.
Do you have your original button? Compare the two. I’ve had several replacement buttons for the Iphone 5 which have been to large, causing issues when I screw the metal plate down all the way. A quick solution is, before putting the phone back together, screw a little bit with the metal plating over the button. Loosen it / tighten it until it feels normal again. In your case it sounds like the plate is to loose, requiring you to press down hard for the button to get contact with the metal plate. Fixed the problem for me anyways, hope it works for you as well. If the button is much larger/smaller than the original I’d suggest returning it.