10-15-2018 01:15 PM
Please try to check if it can be fixed by resetting the camera to factory settings and install a new firmware update.
After that check if the audio is still not working properly.
If issue persist please contact our Customer Support team via phone or chat.
01-07-2019 02:15 PM
Just got a new Hero 7 Black, I'm having the same issue; sometimes it sounds like bold, full stereo, sometimes muffled like it's in a container... switches back and forth every few seconds, seemingly randomly.