Safari halts Youtube videos since Sequoia upgrade

Since the latest MacBook upgrade to Sequoia 15.2 YouTube videos suddenly stop part way through. I close Safari, restart the video and, sometimes, the video continues. Most of the time, however, I have to do that several times before I can finish watching, if at all!

I have deleted YouTube cache and cookies and restarted my MacBook, but that has not solved the issue.

The only way I have found to fix the problem is to use another browser.

Even before this started, Safari would often not display a selected video until I refreshed the page, often several times.

Has anyone else had similar issues, and is Apple aware there is a problem?

[Re-Titled by Moderator]