It is somewhat concerning to me, because although the volume is adjusted digitally inside the Sabre DAC chip, it is controlled by the position of the knob on the front of the device.
So when the volume control locks in place with the motor running as it has started to do now, the volume does not change.
I had thought that the volume knob was really just a visual indicator when using digital inputs, rather than actually doing anything - I thought it was only "active" when using the analog inputs.
The reason this concerns me is thinking ahead long-term. Moving parts are always the most likely to fail, so even if I get this replaced and it works as expected, in 10+ years it's probably going to fail again.
Does anyone recall this happening with the DAC1 HDR units?
I'm wondering if this is a very isolated failure, or if it has happened before.