@TeamYouTube Since yesterday, I experienced problems with the Youtube player; when I go back using arrow keys more than twice, the image gets stuck while the sound continues. The video only picks up from the point I jumped back from permanently, until I refresh the page.
Thanks for sharing all that info. Have you noticed this happening on Incognito? Also, you can file a feedback report, if otherwise, using these steps: https://goo.gl/WdI0BK . That helps us identify and fix widespread issues.