My Digi+ pro will not play 176.4kHz or 192kHz sample rate files from Jriver using DLNA on my Pi3 with DietPi OS. I have other DLNA renderers that play these fine using Jriver. I am using both RCA and BNC outputs with a reference BNC S/PDIF cable. Lower sample rates play fine.
The LPS I am using has DC common tied to earth ground. I have another identical one that is floating and it does not help either.