Since updating all devices to Roon 1.7 (Build 667) I have had multiple occurrences where each end point device running Roon will open/launch and when you select a song to play will look like its playing but no audio will be heard. Only way to resolve is to reboot QNAP NAS to restart Roon Core. Never had these issues prior to this update.
End point devices: 2 Windows 10 version 2004, 1 iPhone 8 version 14.0, connected via ethernet to Netgear C7800 Cable Modem/Router
NAS: QNAP 777, firmware: TS-X77_20201024-22.214.171.1245, Roon Server App version V2020-07-15