Some OnePlus 7 Pro models are apparently exhibiting hardware problems just days after release, in the form of phantom touchscreen taps that apps seem to respond to but which haven’t been made.

As reported by Android Police, the mysterious ghost touches don’t seem to correspond to one particular app or one particular scenario – it’s almost like they come out of nowhere.
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https://www.techradar.com/news/some-oneplus-7-pro-users-are-reporting-issues-with-the-phones-touchscreen