Soundlink around ear whining in one ear and battery drain
My soundlink around ear headphones have recently begun admitting a whining sound in the right ear. It does not happen when they are first powered on, but begins once the voice announces what devices are connected. It then whines intermittently, but particularly when trying to listening something. It seems to happen both when connected to my laptop and phone. I have disconnected them from both and reconnected but this has not solved the issue.
From fully charged, after listening to about 15 minutes of audio with the constant whine in the right ear, the headphones then announced they were low and needed charging again, and the battery symbol flashes red.
I've also tried the product reset (power down, wait 30 secs, connect to power, wait 5 secs, disconnect and wait 1 minute) but this has not solved the issue either. I've followed various troubleshooting guides but with no luck, and when opening a service ticket, the only suggestion is to buy new headphones which I'm very reluctant to do when they cost so much to begin with, are not that old and have not been used that much. Any suggestions on how to fix?