Re booting my QNAP today seems to have sorted the problem. Strange how it occurred whilst listening in the same session and that only Tidal connection was involved the system playing my library perfectly. Panic over for now

Rod

818v3, QNAP HS-453DX, Roon, 7200SE, ARCAM AVR380, REL B2, Panasonic BD 80, LG OLED, SBox Transporter, iPad, F80. Shunyata Delta NR power cables.