Trouble Serving FLAC files to certain devices

I am having a hell of a time serving my FLAC file to certain devices that play these same files locally fine. And can serve the files to other devices without issue.

My main problem at the moment is I cannot get my Grace Digital Mondo to play my ripped flac files. One album that I purchased and downloaded as flac from Bandcamp will play for a bit and eventually quit. There specs of the files (purchased vs. ripped) are pretty much in line with each other. I also had issues getting other Android apps to play the flac files, but went ahead and paid for Serviio to get use of ServiiGo since it worked fine in the trial period. Theses same files play fine locally on the Mondo, but it is not liking them via UPnP/DLNA.

Are there any rip parameters or meta-tagging I need to pay attention to in order to optimize DLNA compatibility? I pretty much rolled with the default flac rip settings on Exact Audio Copy (EAC). Or are there any other Serviio or Windows setting I need to toggle to ensure playback of flac?

I have zero issues playing my entire library, most of which is flac, to:
foobar20000 w/ UPnP plugin
ServiiGo on Nexus 7 and Moto X
Playstation 3 Slim
Serviio MediaBrowser

These same files play fine locally on my:
Fiio x1
Grace Digital Mondo (via USB)

Paid version of Serviio running on:
Windows 10
i7-920
8GB RAM
OS Drive is a Crucial M500 250 GB
Media is on a 750GB WD Black
Serviio PC has a gigabit ethernet connection to the network
WiFi is handled by a Linksys EA3500 serving as an AP
I run a custom pfSense box (not particularly important in this case, but just in case)

[atc98092]

Remember that there's no guarantee that a file that plays locally on a device will play via DLNA. I don't have specific examples, but have heard from multiple people of the same issue. File will play locally (usually from a USB drive) but not over the network. Unfortunately, your only option in these cases is to transcode the audio to another codec.

Now if that same device can play some FLAC files but not others, then you have a different issue, and would need media info from one that works and one that doesn't.