QuietComfort 35 Random Ear-Piercing High-Pitched Tone in Right Ear
I have sifted through a number of similar issues in this forum, but in my case my (newly manufacturer refurbished) QC35 headphones have twice now produced an ear-piercing tone in the right ear. I received the headphones a few weeks ago directly from Bose, and when it happened once, I thought it might just be an anomaly. But it has happened again today, which would seem to indicate a problem.
At no point have the headphones been damaged, and neither occurrence was preceded by any physical interference with the headphones. Each time, I was merely sitting and working in deep thought at my desk. At some point after the first occurrence, it seemed like perhaps the noise-cancelling had changed slightly; although, it is also possible that I have simply become accustomed to it. If anything, I would say the noise-cancelling is slightly more noisy than it used to be: sounding a bit like a distant but constant breeze, whereas previously I perceived it more as pressure than sound.
Since the first occurrence, I have updated the headphones' firmware to 3.0.3. And since today's occurrence, I performed the reset procedure. However, because this problem happens randomly and without any provocation, I don't immediately know whether or not this has helped. I'm posting in the hope that this is a known issue to which there is a fast and simple fix that won't require me to file a warranty claim.