Hi Andrew,
As i have no experience with hifiberry digi i can’t really help on that end. I always like to explore quick fixes or at least try to reassure myself that i have an idea where the problem lies.
In the streaming world there are often two and a half sides to every story. The server, the renderer and the secret half is how they communicate together. If you are not making progress then you can maybe try :-
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Try mounting the QNAP in volumio as a drive, library tab, still got the same problem ?
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Try another server on the QNAP, itunes, minim server, others etc. still got the same problem ?
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Try the analogue out on the RPI to analogue in on Meridian. If you don’t have the problem then it’s looking hifiberry digi and meridian based.
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Can you get your hands on (a lend) another DAC with coax IN.
I’m a sad bastard so i will look at the dlna standard sometime in the next week to have a look at how this effect could happen. However the solution could lie in the hands of the software developers as michelangelo suggests.
Kevin