Help S4 mini makes inexplicable sounds when rotating

[Android Question]

Whenever my screen is on and I make a certain rotation movement (I'm not exactly sure which motion it is, but it has to do something with turning it from landscape orientation to putting it on its back or so), it makes two sounds, often played directly after each other, but sometimes with a pause. There's only the sound. No notifications, no explanations.
Does anyone know what this is caused by and how to solve it? I'd be happy to share additional information about my phone, if required.