DIAGNOSIS The microphone is either obstructed by the housing, damaged by moisture, or suffering from electrical interference.
FIX Check the small pinhole mic on the front. Use a toothpick to *very gently* clear any debris or spiderwebs. Ensure the camera's housing is seated correctly and not pinching the internal mic.
IF THAT DIDN'T WORK If used outdoors, moisture may have gotten in. Bring it inside to dry out thoroughly for 48 hours. Static is often caused by a poor-quality or long USB cable—use the short, thick cable that came with it.
HEADS UP The v3 audio is mediocre at best. Don't expect crystal-clear sound, especially in windy conditions. There are no audio gain settings in the app to boost it.