Why does my screen flicker?

My Macbook Pro 13" Early 2015 has been doing this for a week now (I think that it has been around the time the last software update took place). The screen kind of flickers when there's some specific type of movement, it'll happen randomly in some youtube videos, not every time in the same place, when I type in Spotlight, etc. Also, restarting the computer solves the problem, it presents itself again when connecting it to an external monitor, so every time I disconnect it from that monitor I have to restart the computer again.

Has anyone had this problem? I've reset the PRAM and the problem is still there.

Video of the problem: https://www.youtube.com/watch?v=kIt_jj7AbGg