Just to be clear. I am the owner of a Hero 6 Black and have been having these issues for a long time. It seems as though turning off Video Stabilization fixes this issue with the external mic synchronization. Has this been fixed for the 7? Because the latest firmware update does NOT fix this for the 6.
Is GoPro intending to actually do anything about this so that I can use my camera as it was intended? Or are they/your team just hoping the people that complain about this will go away?