Question Help! Samsung NU7470 55”

Dec 1, 2020
I have an almost 2 year old Samsung 55” 4K TV. After nearly 6 months of keeping it aside as a result of some home cleaning with lots and lots of dust around my place, I put it back on the wall mount myself.
Now when I turn on the TV it works fine for some time and then I see horizontal lines going across and they seem to reduce when I switch it off and on.

Any help is appreciated guys
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