Problems with the audio input d8b Mackie Mixer

[neftali]

Hello! good afternoon , I have a 8db mackie but lately when starting the CPU mixer , everything started well , but after a few minutes the audio input goes and stops ringing , even if the mixer is running, the fader , all apparently normal but no audio input or output .

and attempt to disconnect and reconnect the two cables ( the data and energy ) but the problem is not solved .

I appreciate your prompt response !!