Thanks for reaching out. What device are you using to upload the video? Also, here's our help center article that may help you: https://goo.gl/NCja89 . Hope this helps.
Just to confirm, Have you tried clearing your cache & cookies or using an alternate internet connection to see if that fixes? Also, try re-uploading the video and see if that helps fixing the issue.
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Thanks for letting us know. 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.
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