iPhone 5 touch screen won't work after keeping sliding the screen

do you guys know why iphone 5 screen touch function won't work after keeping sliding the screen, sometimes it's working normal and sometimes it just won't work,why is that?can somebody give me some advice,thanks!

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Was the screen recently replaced? Did this just start happening out of nowhere? Faulty touch screens can happen at any time instead of dead on arrival.

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i found it by accident,i replaced my phone screen, i just slide the screen constantly, and the phone touch function sometimes can't work,and my friends also encountered this,her phone is a new one.

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If her one is new then she should get it replaced under warranty if she hasn't already.

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