Silly idea, but I had a similar problem with a starcom unit years ago. It turned out to be my earbuds ohm (resistance) level wasn't high enough. If you have a regular set of headphones laying around, try that. That's what stardom told me to try and it worked without any noise. I had er-6i's with a 16ohm rating, the er-6's I switched to had a 32ohm rating, same as the earbuds sold by stardom.
Like I said, sounds silly but just might end your frustration.
Our greatest fear is not that we are inadequate, but that we are powerful beyond measure.