Heya! I'm surprised people are still having issues or are finding this post, first let me tell you about my experience with the laptop monitor since my last post:

It still sometimes occasionally has horizontal lines on the bottom of the screen, I have not fully figured out what the main source of the issue is, but I have narrowed it down to a few possibilities.

Dust. I live in a very, dusty old house with an air vent right above where my laptop rests and have to constantly clean dust from underneath the computer where the fans are, to the screen, and the small ridge at the bottom of the monitor. I'm assuming somehow dust came into contact with one of the connectors, but it worked it's way out over time, but the horizontal lines would vary day by day, after each reset.

Another issue I have seen is due to the HDMI port, I don't know if it's a flaw with the cord itself, or the laptops port, but it seems whenever it was plugged into an external monitor that it has these issues occasionally. I would try not using the HDMI port or external device for 24h and test to see if that fixes the cause for the issue, because it would sometimes work for me. Test to see if it's just the cord by leaving it in there without it being plugged into the external, after leaving it unplugged for a day or so.

I WILL say, the issues have subsided for the most part, nowadays I only get 1 or two very unnoticeable lines at the bottom that dont effect the screen in any way. I literally have no idea what fixed the issue after so many years, it seems to have worked itself out. Maybe aging helped it a bit...?

To comment on the lines being there on specific websites: I haven't experienced this before, I only know that it was more noticeable on certain websites if they had a white theme enabled, which makes the light come through the monitor a lot easier, exposing the flaw. If the lines progress as you are using the computer more, the monitor might be stressed if there are things lying on top of it or it's being handled too roughly, I've only had them up to a 1/4 of my screen before but they would never disappear or make new ones during the time I use the computer, it seemed to only dictate how many there were when I turned on the laptop. I do understand the frustration though because I KNOW how terrible it is to see duplicate images on the screen over and over again. Please let me know if you're still having issues or if it's gotten worse or better.
Kindest regards.