I have ROG Strix Fusion Wireless and it have a feature to auto turn off after some minutes of inactivity, it makes really loud peep it doesn't matter what volume level you already have it will just peep at high volume and give you heart attack.
How to turn this off?
It sounds like you are referring to sleep.
The beep could be a notification that it disconnected and went to sleep.
If it's too annoying, you could set it so it doesn't go to sleep or auto turn off.
If there's no option in Armoury Crate, you may not be able to disable this feature.
Doing a bit of searching, I haven't found a way to disable the power saving mechanism.