Long time Naim user first time poster.
I've set up a Raspberry Pi2b with HIfiberry Digital DAC (transformer version) to stream music into a recently purchased a used Naim Ndac. After about 6min and 20secs music stops for about 0.5sec and then continues but the sync light on the panel switches off. The only time sync light remains on is with 24bit material. The issue I am describing happens with 16bit files only. I am streaming from a USB hdd. The DAC's sync light remains on with other sources (TV via optical for instance) and works fine using USB inputs (front and back).
I've tested different inputs on dac, both optical and coaxial digital cables, I've installed Rune audio, tried Volumio, tried USB sticks, tried streaming via LAN (both PC shared folder and USB HDD connected to a router), tested with different power supplies, tried increasing buffersettings on Raspberry, disabled all possible unused features, tried both Raspberry Pi2b and Pi3b and, as you can see, I've ran out of options.
Is anyone using a similar setup? Has anyone experienced this?
When I bought the DAC it had rather old software that did not even play FLACs and I upgraded straight to the latest 4.11.8 version. Perhaps an earlier NDAC update, or doing updates incrementally, would improve things?