Suddenly stop playing

Hello,
I had been playing my mixer allen & heath: 23C for a few hours, and suddenly the Cross mixvibes stopped playing and CUE button started to blink.
I use a Macbook pro laptop and the mixer.
Please, I will appreciatte any comment.
I had been playing my mixer allen & heath: 23C for a few hours, and suddenly the Cross mixvibes stopped playing and CUE button started to blink.
I use a Macbook pro laptop and the mixer.
Please, I will appreciatte any comment.