4K TV keeps reseting to 1080p

Feb 10, 2019
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MY new 4k TV is running way its supposed to problem is when i turn it off, and on again.
My PC it no longer recognize as 4k tv instead its only 1080p.(and even that is not running properly, edges are being cut)
And only after restart of PC its again recognized as 4k.

considering that i never turn my PC off it causes problem, Only thing i can do is to keep my TV on all the time as well.

any way i can keep 4k resolution without having my TV running 24/7 ?

TV:samsung: ue 55nu7093u
graphic card: amd 270 sapphire
2.2 HDMI cable