OSX (Catalina) doesn't detect my QC

I recently changed room and iMac where I use my QC.
A strange thing happens: when turning on the QC, in my iMac doesn’t appear as available audio device.
I have to turn the QC off, then unplug the power cord, then turn it on again, and it gets into the device list…
anyone has an explanation about that?
Could it be due to a defective grounding, or something related to power supply anyway?

@edel - Sorry you’re having issues. The best way to get troubleshooting assistance is to email support@neuraldsp.com and the team will get back to you ASAP.