Minor/Weird Graphics Issue (Not sure if GPU related?)

[Gtiracer]

Slightly strange issue. occasionally have certain lines pop up on screen when using computer, but only doing certain things. There is a particular Facebook game which seems to bring up the issue (screenshot below), but it happens other times too like viewing some web pages, but not many, I cannot reproduce the issue easily.

The card does run games fine when playing, but have had a couple of issues in one game, so wasn't sure if the issue was a bug in the game, it benchmarks perfectly as far as i can tell, its just some of these lines are like anomalies, The monitor is a new monitor Dell S2719DGF but the same problem was on the old monitor. I have run screen tests which don't seem to bring up the strange lines.

The issue is with Tom Clancy's Wildlands, Ghost recon, when viewing the map and zooming in/out, it will show some lines like the pictures show, but i assumed this is where the images are pieced together to create the map as they only show for a fraction for a second when zooming. The other issue is when you zoom out on certain areas in game and far field objects switch between darker and lighter.

Other games are fine as far as i can tell, it doesn't happen often so its hard to pinpoint whats causing the problem.

CPU AMD 1700x
GPU Asus strix 1080ti not overclocked

Screenshots:

 

[inte8er]

When you see these lines appear on screen, if you were to bring up another window to forefront, would the lines stay visible/present? If not and they are specific to the windows/applications on which they appear, it would see that the problem is specific to these applications (rather than them making the issue appear but the affect the whole system, requiring i.e. a reboot to resolve). Regardless, it kinda feels like a GPU/driver issue; the fact that it doesn't happen all the time hints towards the cause being quite specific. If you haven't already, would think reinstalling nvidia drivers with ddu is definitely a worthwhile shot, and if you happen to have access to another gpu, chuck that in instead of your 1080ti and see if you can replicate the issue. Depending on the results and specifically if the problem was not to reappear, it would indeed point towards your GPU as the culprit; talking with asus about a potential rma would be the next step.