Diagonal lines on 2019 27" iMac...

I keep getting a single or a few diagonal lines across my screen. 

Does anybody else get these? I worry that it is a faulty GPU that may soon break down. I have only had the computer for a month and I have already had a GPU tailspin.

I have done the Apple Diagnostics (press D while booting up) and it found nothing wrong…

Any help would be much appreciated. Thank you.