Same issue:
MacBook Pro (16-inch, 2019)
2.4 GHz 8-Core Intel Core i9
64 GB 2667 MHz DDR4
WiFi: OFF
Bluetooth: OFF
Roon Version 1.7 (build 571)
macOS 10.15.5 (19F101)
Turning WiFi on solves. The fix remains if I then turn off WiFi. Is this a phone home gone wild? What the heck does WiFi have to do with Roon?