Question External mic making my voice disappear when singing long notes

Aug 5, 2020
I just bought a new external mic on this week and tried it immediately. The mic worked just fine until I tried to sung a note in a long duration (more than 3 seconds) and suddenly the mic counted my voice as 'noise' and 'cancel' it. My internal (laptop) mic doesn't have this problem. Did anyone has the same problem like me? How to solve it?
This below is the test I've done to check it by speaking 'A' in a long duration (more than 6 seconds) on my internal and external mic. The difference can be heard starting at around 5 seconds mark.
Any help will be appreciated, thank you!
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