Troubleshooting audio During Zoom Meetings

Hello, I am a host for our church services on the Zoom Platform and I have just run into a problem during our service the audio portion of a participant that sings and plays the piano just shuts down and cannot be heard. This only seems to happen when the participant is playing and singing. When there is just dialog (different people speaking) the audio is fine. Just not sure if it is the microphone device settings are the problem or the microphone device itself or the computer the participant is using is the problem. This has happened with two different participants as well, within the same week. The first participant is using a Samson-Satellite Broadcast microphone hooked into a Dell computer. Any recommendations or help would be appreciated.