We'd like to know more. Does this happen across devices? Also, try to clear your browser's cache and cookies which clear things up most of the time. Let us know if this makes a difference.
Appreciate the info. Please send a feedback report directly from YouTube with these steps for us to work on it: https://goo.gl/WdI0BK . While every individual report may not get a direct response, we do review everything and use the details to investigate and fix issues. Thanks!