@TeamYouTube I've been experiencing a lot of videos stopping and buffering at random times, yet my internet is perfectly fine. You guys may want to check what's going on.
Thanks for bringing this to our notice. We presently don't have any on going issues related to this, but clearing your browser's cache and cookies clears things up on desktop, updating or reinstalling the app often fixes most issues on your mobile device. Let us know how it goes.