audio problem

Hi everyone, just received my brand new SJ7 Star, that I plan to use for my honeymoon; this is my very first action cam. I didn't make too many test but I just tried some videos in 4k and everything seems to work, except audio. The cam seems not recording any audio at all, all I can hear is a...

I purchased a Rexing V1 last fall and it seemed to work fine for the first week or two. Then I hadn't checked the video files until about 2 months ago. I found the audio recording had been cutting in and out intermittently. The video recording looked just fine. I'd put it back in the car and...