It's the content going away, force quit app or switch to landscape and it fixes the issue. happens with Mail, Safari, Phone apps, never happens on third party apps, not a hardware issue, has happened since day one with 26 for me
It's the content going away, force quit app or switch to landscape and it fixes the issue. happens with Mail, Safari, Phone apps, never happens on third party apps, not a hardware issue, has happened since day one with 26 for me