AirPod case making unknown ringing sound

literally the same thing happens with me. This started just a couple of months after getting my AirPods. It happens the first time i pick them up in a day or when I move the case. They do a ringing sound like three cycles and then stops. But it’s not the find me sound it plays, a bit similar but no. It’s a sound I haven’t heard like anywhere else, not when it’s changing etc. I wish apple would do something about this, because it is so embarrassing when it just plays in the middle of class or something. I tired to chat with apple support about this but since you can’t attach videos I couldn’t really show what I meant and they did not help one bit.

[Re-Titled by Moderator]