Thank you for being with Samsung and sharing your concern. We would like to inform you that kindly follow the steps below to resolve the issue:- 1 Adjust the brightness of the device then check (Setting-->Display-->Brightness) 2 Disable the “Show Screen Updates"" option in developer options or completely disable the Developer options.{(Setting-->Developer options (If its available & highlighted)-->Show Screen Updates)} 3 Check third party applications if downloaded recently. Post which check in Safe Mode, if the issue still persists. 4 If the device is in Safe mode and the problem still exists, we would advise you to create the Data backup & Factory Reset the device. 5 Periodic Software Update through FOTA, SMART SWITCH or Smart Tool is intended to resolve the issue as well. Be sure to hit ♡ when you find an answer that works for you. Be sure to hit ♡ when you find an answer that works for you. For Further assistance, you can get in touch with us via Live Chat option by following- http://livechat.support.samsung.com/Customer_new/IN. You can also connect us via Samsung Members web community by following mentioned url-https://community.samsungmembers.com/en_IN#/
