[bigyabai]

Try moving your couch. It's possible that you're sitting in a resonant part of the room that amplifies background noise through room modes: https://en.wikipedia.org/wiki/Room_modes

That's a long shot, though.

[tinnitus_crazy]

I’ll definitely try, thanks! As a pre-measure, I won’t go to the living room for some time and closed the door, as it’s easier to test.

[Obscurity4340]

If the sound comes with you when you go into another room its probably you tho. If it follows you