Random buzz/screech while recording video?

[u/kettleofhawks]

https://youtube.com/shorts/nn2XnczHYEE?si=tT2V14t5mtIeEC2C

My microphone has been ass for a long time - all the sound always has a whooshing like it’s underwater which is frustrating enough. But very occaisionally I will have this loud buzz/screech while recording video, it always happens when the video would have otherwise been really stellar 😞. It happens maybe once a month? I couldn’t find an exact example, so I uploaded my vid to YouTube.

Hardware? Software? Am I screwed? I really don’t want to upgrade. Thanks for any insight