Audio stops playing - USB Codec output - "sound" in System preferences

We play music at our church from iTunes on our MB pro to an Allen & Heath 420 mixer via USB. This is switched to USB output in sound in System preferences. We have been doing this flawlessly for about 1.5 years.
Recently, in the middle of the music it stops. There is no more signal to the mixer but if I switch the preferences to internal speakers there is sound continuing. The only fix is to reboot which is very problematic in the middle of a music set.
This happens also when playing through the USB from Garageband as well.
It seems like a system wide codec issue but I don't know what the fix is for it.
Any suggestions? I cannot simply switch to using the miniplug because we record through that.

Find another Mac and check that the A&H works, report back.
You should also consider a decent external interface, recording off the minijack is the worst choice.

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Audio stops playing - USB Codec output - "sound" in System preferences

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