Older reports seem to have been closed.
I’ve had a weird chirping and burbling sound for the past few weeks.
It sometimes sounds like a small brook flowing through my living room, but a bit more high pitched.
Based on a suggestion found under “Weird audio chirping noise with new Quad” I rescanned my channels and it has improved significantly, which I take to mean that it’s an OTA signal issue.
The sound is heard on my Firestick and via the WebApp.