Why there's an occational horizontal lines on my screen

I’m not sure what’s wrong with my MacBook. I mostly use it at home and rarely take it outside. I suspect the issue might be related to the heavy moisture in my room after turning off the AC or possibly due to overheating from binge-watching last weekend. I usually take good care of my MacBook, especially after a previous issue that cost me more than 27k. I hope I can find a solution soon.