If you found youtube glitch black screen on your device. Then, you don't to get upset about it because here I will tell you the solution about it. So, you can read and apply given steps:
Check the Status of Your Network Connection
Update your Browser
Clear Your Browser’s Cache and Cookies
Disabling AdBlockers and Extensions
Check Adobe Flash Player
read also: https://ityug247.com/best-youtube-comment-finder/