Up2Stream Pro stops playing after few seconds

Hi guys,
I have a problem with an Up2Stream Pro that seems to stop playing music after few seconds.
It worked very well for 3 months, integrated in HomeAssistant, but for the last week i cannot use it anymore.
If i play directly from Spotify it stops. If i play from Music assistant or any media card inside HomeAssistant it stops. Also in Music Assistant in wont play at all for the last 3-4 days, and i have a “status-like” : external source active: USB_DAC and no movement.
When it stops, the red led is on for few seconds and back to white.
I tried resetting the device, factory reset, i’ve reset all i can think of in Home Assistant, and same thing happens.
Does anyone have any idea of what is going on ?
Thanks in advance.