Some early Google Pixel 2 XL adopters have reported a screen burn-in issue to Google support. The story was initially brought to public attention from Android Central editor Alex Dobie, who used a Google Pixel 2 XL for a week before the issue cropped up. In his case the navigation buttons appear to have burnt-in. Google support says it is "actively investigating this report.". That's some pretty wild OLED burn-in on the Pixel 2 XL after maybe 7 days of full-time use pic.twitter.com/EPJTs6D0Kg Alex Dobie (@alexdobie) October 22, 2017 Screen burn-in almost exclusively affects OLED...
Source: https://www.gsmarena.com/some_google_pixel_2_xls_show_burnin_issue_google_looking_into_it-news-27862.php