QuietComfort 35 II won't stop saying battery level + mosquito whine
When my headphones are plugged in, the voice just starts this cycle of saying: "battery 90 per-- battery 10 perce-- battery 90 per-- battery 20 p-- battery 60 per--," and so on and so on. I can't notice a pattern in the battery level. And as the headphones does this number, the sound cancellation turns on and off the whole time. I can't connect to any Bluetooth device, or clear the devices, or really do anything besides listen to the headphones sputter the incorrect battery level.
Also, there's a high pitched, mosquito noise that is on in the background whenever the sound cancellation cycles on for 2 or 3 seconds.
It usually stops after a few seconds (battery levels, sound cancellation and whine), and must power off, since I haven't been able to drain the battery for the last few weeks.
Other weird details: when I tap on the headphones, it interrupts what ever battery level is currently being read and it restarts to the next random number. Also, if I place my finger on either side of the headphones, I can slightly alter the amplitude of the high pitched whine.
Clearly something is very wrong. I want to know what part in particular could cause these symptoms. They're out of warranty, so I'm hoping there's a DIY solution, like replacing the switch or replacing another broken component. Because I can actually alter the message and the whine by physically touching the headphones, it makes me think that there's some mechanical failure.
Thanks for listening to my tale of woe
--update-- I plugged in my headphones for a few seconds, unplugged, and now it won't stop the cycling. It's been doing the battery level routine for about an hour. While this was happening, my Android phone just detected them and tried to pair. But the pairing fails. Other than that, everything is the same.