1,Please check that the camera's External Microphone option is off during the recording. You can tap on the ‘External Micophone’ icon in the system setting menu while the external microphone accessary is connecting to your camera.
2,Please go to the camera menu and turn off the WIFI option.
3,please go to the camera menu, Sound Effect then enable the Wind mode on.
If the issue still persists after following the above steps, please get back to us at firstname.lastname@example.org