Powerconf S3, only sound on starting, tried multiple devices and reset

Hi all, as per title, the device boots up, plays it’s opening jingle noise, and cuts off about halfway through and no further sounds come out despite being connected to my phone (I’ve tried multiple devices, and resetting the Bluetooth history on the device and my phone)

Ideally I could attempt a firmware roll back, but has anyone else had this issue and if so how did you resolve

Any help appreciated,

Ollie