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There may be a software glitch on the phone.
First, try powering down and restarting the phone.
Let me know if that resolves the issue.
Sorry for any delay at this exceptionally busy time.
Does the problem occur with all callers or only some?
If the restart did not help then there may be a conflict from another app, or the microphone hole is blocked:
Have a look next to the charging port, there a tiny hole there - ensure it is not blocked. You can clean it out using a sewing needle. Let me know if that works.