Sony 75XD9405 - Banding Issue

[TheGreatDane]

Hi All,

I've had the set for going on 4 years now and its been absolutely perfect.

However in the last 2 weeks it has developed vertical lines pretty much running across the whole screen, visible on all sources (ps5, switch, sky q and inbuilt apps).

Highly noticeable on dark scenes and still noticeable on light ones from all angles.

I'm going through the warranty process with Sony as I have 5 years, however I'm feeling they are going to say its normal (despite it only starting 2 weeks ago).

Here are two example images: https://ibb.co/kXNSjGj and https://ibb.co/55NpF49

Would you say this is acceptable?