Hello, I'm terribly sorry to hear about this experience and would encourage you to run a picture test on the television. https://www.samsung.com/us/support/answer/ANS00077524/ If this issue occurs during the test regrettably this will require service. If you are out of warranty, you can use this link https://www.samsung.com/us/support/service/ to find a service center in your area or you can feel free to private message me https://bit.ly/3p4UuiW with your full model and serial number to review service options.
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Probably the panel going out. If your TV has a pixel refresh feature try that. If not, try some pixel refresh YouTube videos. If that doesn't help you can try a factory reset but you'll lose all your settings. If nothing works I'm afraid it's time for a repair or replace.
