WHITE NOISE.
I have Mojo not Mojo 2. I normally use coaxial in from a Fiio M11 Plus so as to not have an issue with white noise. I had never experienced the white noise problem but for the cost of a nice little Moon Audio cable I thought I could avoid the risk so it seemed like a no brainer.
Anyway, I recently got a iPad mini 6 and have been using that with the Mojo a bit. The other day I was doing some A-B testing with iPad into the Mojo with a very firm fitting ddhifi C to Micro cable and was swapping out headphones plugs while very firmly holding the Mojo down on the desk. I am 99% confident that between the snug fit of the cable, me holding the Mojo and the fact the cable was still very well seated afterwards the USB cable was not disturbed.
Well I got the white noise, luckily I was using DCA Aeon so it wasn’t actually very loud.
Just throwing that out there for consideration.
To me I am 99% certain the only thing that was happening to the Mojo was headphone swapping and it seems that somehow triggered the white noise.
Unless it was purely coincidental and it just started on its own out of the blue, the same track was playing the whole time, there was no change in music source so that doesn’t seem likely but perhaps it could be what happened.