Same here
Already emailed to support:
Using "Auralic Aries Femto" as a source and several Dac's (RME ADI-2 Pro Fs BE; Audio GD R7; Chord Hugo 2)
Trying to isolate the problem and making sure it really the U16:
Using a direct USB connection between "Aries Femto" and "RME ADI-2 pro", there are no issues at all, even when I upsample in "Aries Femto" up to 768khz.
Putting the U16 in between (same USB Cable as before now connecting to U16 and using digital coax cable (75ohm) to RME ADI 2, I'm getting the problems with 176/192khz/16 and 24 bit.
I also tested with HDMI/I2S (PSA mode) and XLR connection from U16 to AudioGD R7, same problem. And also Hugo2 via coax (U16>BNC) same issue.
Just exchanging U16 with "Sinxger SU-1" (same cables, etc), everything works perfect.
Furthermore the RME ADI-2 pro has a feature to detect a bit perfect transfer, for some special files, with different sampling rates and bit depth (see their website for:
Bit Test Wav files for ADI-2 Pro, ADI-2 AE and ADI-2 DAC, includes 16 / 24 / 32 bit test at 44.1, 96 and 192 kHz sample rate.):
With direct USB connection from Aries, the RME ADI 2 detects all files as bit perfect transfer. Putting the U16 in the middle, RME detects bit perfect transfer only for 44.1 and 96 kHz sample rate (16 and 24 bit), but not for 192 kHz (even in the time before the distortions starts). While distortions is ongoing the RME shows "invalid SPDIF signal", seems to reconnect for a fraction of a second and loses sync again, reconnect, loses again...