I am using this app since one week and after normal recording for few days, just two days ago the app has recorded (as mine) noises which where very very strange and inhuman. The recording happened around 3.27 and lasted for about 4 min. The phone was put on the flight mode during my sleep. Next night the recording were as usual. It is difficult for me to believe that it really were sounds in my bedroom so I suspect some error in the app.
I included the link (https://drive.google.com/file/d/1sgm7xTG0_31lumD9NSmQ08UTOW7B0mAh/view?usp=sharing) to the recording so you would understand yourself what I am talking about. I would appreciate your feedback and how to avoid this in the future as it is very creepy.