75" QN85D issue with black shadow on left and right side

Hello, Today I was watching football and I noticed that there is a small black shadow on the right side of tv. I sit straight from the left side but if I do half step to the middle the shadow disappears a bit. I don't think it's the viewing angle as I am straight to tv but not in the center. Do you think I need to contact with support for the tv or anyone had similar issue?