Webinar Advanced Share Video with Share Audio Stopped Working Mid Session

We experienced a challenge mid-session during a webinar, where the Advanced Share advance video audio option was grayed out. We had used the feature earlier in the session, but when we wanted to use it again, the host and co-host did not have an option to share video audio. No settings were changed, and it started working again after some time, adding another co-host without changing settings. Has anyone else experienced this or thoughts? Thank you.