a few days ago a sound suddenly kept playing randomly and I can't find it's origin, i tried everything, and it seems to originate from Opera, since when it's played Opera appeared on my sound manager, but i cant find what this sound is and how to make it stop , here is the link to the sound, you'll hear that it seems to repeat regularly but that was when i was not on the computer ( i left the recor program to record all night ) anbody has an idea of what it could be ?
Link to the sound : https://soundcloud.com/kugutsu-uta/bruit