Is there any debris near the microphone hole of the camera? Sometimes tiny metal particles can collect on the top of a microphone and cause annoying background noise. Try vacuuming that tiny elongated hole on the top face of the camera and gingerly scratch the surface inside that hole with a toothpick at the same time. The toothpick can get any debris dislodged from the tiny microphone screen and the vacuum will suck it out of the microphone hole. Don't apply any pressure to the toothpick, just kind of drag it along the inside. Don't jab into the hole either. Dragging the toothpick should be enough to move any particles around and off the microphone screen.
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