Intermittent flickering vertical and horizontal lines

Intermittent flickering vertical and horizontal lines

I'm getting flickering horizontal and vertical lines. Sometimes this issue stops when changing between apps in the Roku menu and the TV can be used as normal until the power is turned off, sometimes the issue is constant and nothing stops it. Putting pressure on the frame around the screen doesn't affect it. TV has not been dropped or damaged, and this issue didn't start until a couple years after purchase.

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