NuWave DAC not going to standby mode

Never a problem with USB input from my PC but after attaching to a new Mac mini it will briefly go into standby after shut down but comes back to lock and native as if it is getting an input signal. I’m fairly certain it worked correctly when first hooked up to the Mac but tried BitPerfect and now it is exhibiting this behavior.

Hooked up the PC to troubleshoot and the DAC will go to standby. If it is powered down after shutting down the Mac it will go to standby.

Can’t figure this out. I’m new to Macs and can’t help wondering if the driver was somehow corrupted or is it a problem with the DAC. Help!