It did that for 3 minutes two nights ago and came back to normal but last night, the problem appeared again and never stopped. I just did enough tests to make sure it wasn't something else. It's the TV.
Too late to check unfortunately. I've cut off the power cord, and it's heading to the recycling centre. I replaced it with a 20" CRT Sony Trinitron my chiropractor gave me in 2019.
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R.I.P. my first and only TV I ever bought new.