So broadly and according to what you tell us, it has the appearance of some fault in the touch sensor of the screen in that area.
Samsung phones have a testing option for the Hardware and so check that speakers, microphone, camera, screen etc etc work ok.
Go to the keypad of your phone as if dialing a number, type * # 0 * # (all together and without spaces) and you will get a test. Look for the "touch" option and make the drawing by running your finger through all the boxes If you do, "apparently" you should not have screen problems.