I hear a strange sound from the floorboards. I made a recording of it which you can hear here: https://drive.google.com/file/d/1idaOVQx1O4OhvbT2lnnJm-lqSgdSJrQJ/view?usp=sharing
Here is what I know about the sound:
- It happens only at night (which makes it specially annoying since it disturbs my sleep and makes it harder to diagnose).
- It happens at irregular intervals. Sometimes I will go hours without hearing it and sometimes I will hear it several times in a minute.
- It comes from a part of the floor which has loose floorboards.
- It comes from a part of the floor next to the heater.
I have a wooden floor. What could be causing this sound?