YouTube randomly goes dark during videos

I first noticed this when I was watching Markiplier’s fnaf 2 livestream and I thought I was tweaking. I switched over to my tablet and it wasn’t happening on that screen. Any ideas on how to fix this? (Can I not put videos here?)

Edit: [here’s the reference](https://www.reddit.com/u/Surprise_Shawtyy/s/4RAYvNyjOm)