Have had my 5s for a week now and keep noticing that it often requires a slightly harder press to do things on my iPhone. I keep thinking that its the iPhone (hardware defect) but it works fine if I press harder. I'm noticing especially that sometimes I have to press something twice on the sides of the screen to get for it to register. For example, in the contacts app, the little letter slider on the side, tapping on it sometimes has no response, I have to press harder for it to register. Has anyone noticed this? Am I insane? My iPad mini has iOS 7 and I haven't noticed any differences, so maybe the screen on my iPhone is defective? I tried using notability app and drawing on the screen and everything seems to register, so I doubt I can convince an apple genius to replace the phone and don't even know if I should because it seems to be flawless and I don't want to risk it with another one.