@themaciekk Yeah! This solved the problem. I never thought it could be Twitch. Thanks!

I don't know what the sound means. I tryed to disable the "play browser sownds", but the beep continues. If someone knows how can I disable this boring sound, please, help me.

I Have the same problem. Every minute the Opera GX sound a "bip bip". I disable the "Play browser sounds" and the "bip" don't stop.