Embedded YT video as in YT video that are attached on articles and such?
Could be YouTube's issue, or the app which you are playing the video... I understood as you using things like browser or FB and the YT video attached has issues. If I understood correctly then it can be submitted to Samsung Members after recreating the problem.
If it's Youtube app itself having this sort of issue then reach out to Google.
I think it's an app issue, but just not clear which app exactly the issue is occurring in your case.
Please share device's model number and software version.