My daughter has a Samsung (it's about 3 years old and I don't recal the model right now). She has a similar issue but the left side of her panel has a distorted color and picture to it. Opposite of your problem, but it goes away after the tv has heated up a bit. If she presses on the bezel in the corners, she can change the distortion pattern so that it goes away. It's as if something has come loose on the panel and if you press on it, it makes contact and goes away, or, after it heats up, the expansion makes contact and the picture is fine. Her tv is out of warranty so she just deals with it until it warms up and goes away.