I've had Mojo 2 for several months now, I was lucky enough to get one shortly after it was released.
I previously had Mojo 1 for roughly 5 years and have never experienced the white noise issue at all.
However, in the last 2 weeks I've had 2 disturbing experiences where the Mojo 2 has made a very loud whining sound through the headphones shortly after the power on cycle has completed.
Set up is PC as source connected to Mojo 2 via spdif out to optical in.
The first time it happened I powered on Mojo then powered on PC shortly afterwards. The PC had not booted to Windows yet when the Mojo finished power cycle and emitted a very loud whining noise, starting at a high pitch and descending lower for around a 1-2 sec duration, similar to the sound a balloon makes when quickly releasing the air from it. I had just put the headphones on my head at the time and managed to rip them off quickly because it was ear splitting. My wife actually ran in from the other room asking what the noise was (open back headphones).
The second time it happened the PC had fully booted into windows before I powered on Mojo, but it emitted exactly the same whining noise, luckily I didn't have headphones on this time.
I would appreciate an explanation from
@Rob Watts as to whether the device is faulty or if this is another known issue?
Either way I feel I'm probably going to return the Mojo.