Video & Audio Switches

On a Windows 10 desktop, my web camera switches off, and the audio switches. This happens every time. video and audio switching occurs less than a minute into a zoom call. If I try to unmute it, it goes on and turns off again for both the audio and camera.

I get two messages on my screen. 

First: "Failed to detect your microphone. Please make sure your microphone is properly connected."

Second: "Your default microphone has changed to Microphone (Realtek USB MIC) and will not be used.

These messages will keep popping up until I stop using zoom. Additionally,  my camera has a built in mic and when I test the audio setting, the speaker and mic work fine.

Any ideas?