Why is the keyboard of IPHONE4 sometimes insensitive?

Screen problems, you can clean the screen and re-film. If this phenomenon only occurs in these three-letter areas, it may be that static electricity has penetrated your screen. This is what the capacitive screen fears most. This is irreparable harm.

There are too many things that can generate static electricity, but generally static electricity has no effect. The screen is antistatic. When the static voltage is too high, it is hard to say. . It is best to stick a special film for capacitive screen on the mobile phone. . . . . I saw you say that the mobile phone responded before touching the screen. In this way, you tear off the film on the screen of the mobile phone, clean the screen with the cleaner that cleans the screen of the mobile phone, then stick a better film, turn off the mobile phone and leave it overnight without charging. . I also had this problem with my mobile phone, and that's how it was solved.