I have just returned my 5th LG65E7V oled this morning after each one had awful vertical banding issues,Oled's were purchased from Seven Oakes/Crampton and Moore/and john Lewis.
This spoilt what is a fantastic tv,but £4000+on an Oled with these poor quality control issues was not acceptable.I contacted Lg various directors at LG but none replied.
I understand Sony A1 users are also seeing the banding issues,as its the same panel.
I think because LG has to make so many Oled screens for themselves/Sony/Phillips/Panasonic the yield of quality screens is low ,so the quality control reflects that,unless you are Loewe
.I am on the understanding they have a deal with LG and as such ,get the best screens.
I will wait till next year and see if they improve the process and eradicate this banding issue.