bhai this problem sending samsung because samsung has not removed knox from their system.last day gone 19 december of samsung of nougat phone oreo phone and samsung has not sensing new updates after 20 december for removing knox from their syatem. samsung jaan boojhke ye kar raha hai mere s7 edge mai bhi yahi problem hai pichle ek week se aa rahi hai ek side right side per red line from up to end corner..samsung shame on of you
We apologize for the inconvenience caused. We would suggest you to visit nearby Samsung Service Centre so service engineer will examine your device physically. Please find service centre details in the link provided http://www.samsung.com/in/support/servicelocation/ Be sure to hit ♡ when you find an answer that works for you.