I changed the configuration file yesterday turning Wi-Fi back on, re-booted the system and today it sounds wonderful again. Maybe the differences were just in my imagination though I still think that 24-bit recordings sound a bit more airy
IMac macOS 10.15.3 (no link to Devialet ) / MacBook Pro Retina OS X 10.14.4 / Linn LP12 / Devialet 200 / Wilson Benesch Discovery.
Qobuz Desktop Latest Version / Audirvana 3.2.18 / Audirvana Remote / iTunes 12.9 / AIR 3.0.4 / Wi-Fi / FW 8.1.0 / SAM 50%
Cambridge, UK (Updated 27th February, 2020)