@Snyari: If you head to the Samsung Members app > Press and hold on the app icon > Diagnostics > Mic, and follow the on screen instructions, are you able to hear yourself during the playback for each of the microphones? If so, you may wish to try closing any background apps via the Recents button in your navigation bar (3 vertical lines), before you try to record a voice note via the affected applications. It may be the case that an application is already using the microphone, and this may create a conflict when you attempt to record your notes. Let me know how you get on.
