I have updated my phone before 3 month to oreo..But nowadays i seeing that my nokia 8 display facing burn in issue in 4 side of display. And status bar icon stays at there but not in all time but when i open picture like grey color have in it shows burn-in effect. what should i do. But wgen i test rgb pixel color it shows all are perfect. But in grey and greish black color came burn in issue shows.