Roon does not connect to my Linn KDSM2; other devices do appear

Roon Core Machine

QNAP NAS TS253A

Networking Gear & Setup Details

TP Link DECO M3
Linn KDSM2 = hardwired

Connected Audio Devices

Linn KDSM2 hardwired to my modem / TPLink deco m3 to operate roon app

Number of Tracks in Library

Only Roon streaming

Description of Issue

The Linn KDSM2 does not appear as an audio device since a few days. Have restarted the NAS, the modem and router and rebooted the Linn. Nothing works. Other devices like chrimecast and Sonos do appear.

A post was merged into an existing topic: Linn Devices only showing up as AirPlay with QNAP Core after updating to build 1148 [Roon Investigating]