When I turn away from anything that outputs audio (Juke Box, Door Closing inc Creepers) the audio fades away so any early warning I would have of something attacking me or listening to a music disc, means I have to face towards the sound in order to hear it.

Edit: It was something to do with 7.1 surround sound in my headset software. It still affects my headphones but in stereo it works fine. Maybe Minecraft Bedrock doesn't support 7.1 properly or I have something setup wrong.