Did you RUU back already? Mine was like that too... Working in the morning and it stopped in the afternoon. I had the phone in my pocket the whole day while I was doing the lawn... Maybe too much heat broke it. Try RUU back to check if that works. If not you can find the screen set (lcd and digitalizer) for 55$+
This is mine... What I do I have screen rotation enable and when I cannot tap on something I rotate the screen.
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I'm JuSt MaRT! and I'm AWEEESOMEEE!
YO soy Puertorriqueño!