We'd like to help. What device are you using? Does this happen across devices/browsers? Also, are you receiving an error message when the live stream freezes? Let us know.
Thanks for trying. To help the right team better investigate, can you send a feedback report from the device/account having the issue? Steps here: https://goo.gl/WdI0BK . You may not receive an individual response, but the details will help us identify and fix any issues.