It started for me with the last update a couple of days ago. I have spent hours trying to find a solution and there's none i can find. From my searches it seems that this has been a recurring problem since at least 2010, so I'm not hopeful of a fix from them. What also narks me is that whatever is triggering the sound resets the notifications and system volume settings to max when I set them to less than max, so I can't even turn the volume down. Even if I mute the phone it turns it back up to max and it means I can't even take it into meetings. I also hate the new UI they pushed on me with that update, I can live with that but the beeping is driving me insane. eta: I finally worked out what was doing it - it's an IFTTT service that unmutes my phone when I return home - by the look of it the max charge is triggering it and so everything is being reset.
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