Dark Horizontal lines on MacBook Pro 2017

I have a MacBook Pro 2017 non-touchbar.

My screen is having a horizontal lines in the bottom till the middle of the screen as it shown in the picture

When I let my MacBook Pro runs for more than 4 hours the lines start to appear and within the time the lines get darker.

When I shut down the computer and turn it on immediately the lines get less darker and if I shut it down for some time the lines disappear.

What is the reason for this problem because I’m not even running a heavy application and it’s not overheating according to the numbers but somehow my fan constantly runs on 1200rpm

It’s really frustrated that I spend above 1500$ and I keep getting this problems. First problem was my trackpad haptic feedback didn’t work for some time for no reason and now it works by itself