I've also ran into this issue along with some users that I support. It seem every means to try to discourage the behavior via the work-around seems to be discounted and disabling the notification sound can only be done by turning down the master volu...
I noticed this went unanswered and only came into seeing this as someone I was supporting reported having this same issue.
In her case, the beeping only started a day or so ago. There were some systems issues that had been encountered prior, but asi...