I am not sure I have a big experience of running Audirvana using NAS stored music tracks.
On my Home system, the music files are stored on a Thunderbolt Hard Drive. A mirror copy of my music files is made on the NAS, and automatically updated whenever any modification is made to files. It provides me with a relatively stable system.
This is the system I use most.
Occasionally I run Audirvana on my MacBook using the files stored on the NAS. I cannot report any specific problem. I just make sure that the database is synchronised and maintained properly and regularly.
Others have reported repeated difficulties with duplication of tracks and albums, pointing out at such difficulties to the fact their tracks were stored on a NAS.
In my experience it has happened to me too, but with locally stored tracks.
My gut feeling is that it may have something to do with the way Mac OS “follows” the files around the system when moved, with Audirvana playing catch up with some difficulties.
Also, many of us use iTunes or Apple Music to manage metadata or feed our iDevices with the track files used by Audirvana too. It may create some “cross-contamination” that Audirvana does not yet deal with well.
I trust the development team is quite aware of these niggling difficulties and work their best to find a good solution. A future release will surely solve that problem.
As for DLNA, I have never been impressed with it as beyond communication protocol itself which may be fine, the different connected systems may prove incompatible when it comes to file formats.
Too much bother, I would not rely on it for much, Plex being the only exception as it corners all facets of the management and distribution of the resources.