Humming sounds that persists after i've done a legends instance.

[Littlestar b-k]

As the title says, i suspect it happens in storehouse altho i'm not 100% sure about that.
I'll try to remember when it happens again to take note.

This humming sounds continues until relog.

 

[Littlestar b-k]

It starts right as you enter the last room (jeef qaher cuhof guardian) and it doesn't stop until i relog.
I sounds like it could be intented as a sound in the room?

Edit : It actually starts as soon as you killed the 3rth mob in the last room and the timer starts, not when you enter.