I am having a similar problem as you but luckily nowhere near as bad as your issue, but my vertical black/shaded band is center-right and a small band that is center-left on my screen. I bought my Samsung TV - Samsung - 55" Class - LED - NU7100 Series on 4/20/2018 and I can't believe I'm having problems already! I only bought a 2 year extended warranty so I guess shame on me for having faith that Samsung would be reliable and that I wouldn't need the warranty extended past that 2 years. I DEFINITELY will never buy a Samsung TV again and will be going with Sony from here on out.
