[PROBLEM] Cyrus soundkey intermittent distortion

[GStevens]

I've just found this thread which identifies the same problem that I am experiencing with a Cyrus Soundkey. I'm using a Pi 4B with 8GB RAM, with the DAC plugged in to a USB 3 socket. The distortion usually occurs for a few seconds and then disappears again, usually a minute and a half or so into a track. The problem occurs using Eterhet and Wireless. No such distortion is heard if I skip the Cyrus DAC and just use the headphone socket on the Pi.

Did anyone ever get to the bottom of why this occurs?

TIA,
Geoff