No audio or webcam in Virtual Class recording

We ran a Virtual Class recently. There were no issues with the live session, however 4 minutes into the recording, both the audio and the webcam stop although the document sharing and chatbox continued to record. We have used the same meeting with the same group before and nothing was done differently. You could see from the microphone icon that the host continued to speak and the attendees were able to hear and see her but this was not recorded.

I have tried to search the forum and although I see some issues with recording audio, I couldn't find a problem of this nature.

Thanks in advance for any help.

Sue