Microphone fading itself on moto e4

[androidmusic334]

Good day to you. I noticed while recording my voice that during playback the recording fades out towards the end. I found a YouTube video that has an example and a solution for this problem, but it's not for the Android mic, but for computer. Here's the link to the video: https://youtu.be/RkFjoruplnc

but does anyone know how to fix this issue on the Android mic? Please get back in touch as soon as possible, thanks. Jay.