We have a Frame TV that will turn 3 years old this month.

Recently we have started noticing a section of the screen is darker than the rest. It's particularly noticeable when watching sports -- as the camera pans left or right, you can really see the image change as it moves through the dark section.

I've tried fiddling with the brightness, tried other inputs, tried the self-diagnosis tool, nothing helps.

Attached is a picture that highlights how it looks and where the darker section is, in lower part of the left half of the screen.

It really makes watching programs annoying. I would appreciate any help. Thanks.