I am using the S20 FE Exynos version. Currently, the phone is on Android 11. Lately, I figured out that the display is flickering while watching Instagram Reels videos with 60Hz refresh rate. The flickering issue decreases when the display is 120Hz; however, volume up and down buttons trigger the flickering issue. I also have same issue at very minor scale while using browsers.
I've contacted some other people who are using the same device, they confirmed the issue as well. Have you experienced such a case? Do you think it is a software-related issue, or is it a hardware issue?
By the way, I did a factory reset after upgrading to Android 11 and also cleared the cache/data of the application.
Here is a video of the problem:
What do you think?