Have you tried uninstalling the app, restart the device and reinstall the app to check if that resolves the issue? Also, try switching to a different network to see if that makes a difference. Let us know.
Appreciate the info. Please send a feedback report directly from YouTube with these steps: https://goo.gl/WdI0BK . While every individual report may not get a direct response back, we do review everything and use the details to investigate. Thanks!