My admin panel keep blinking (sound) and the title changing from normal to " You have a new message".

But what message? Where? cant locate anything at all - not sure if related to any plugin (i got the chat and the instant messaging), but i dont think they relate with backend

Maybe instant messenger?
Could be false notification if you are in backoffice.

Yes on backoffine. But i dont have any notices. How can i fix this? I have many tabs of my backend open and my speakers blinking unstoppable

if you are logged in as user and admin at same time, maybe you cannot.
But to be honest I never seen such behaviour.

hm yes just checked it. You are right. This behavior happens when i am logged in in front. Weird thing is, in front as user i dont have any new message. Basically got no messages at all

But in the backend i get that blinking and changing "title".. Seems like a bug, but as long as i can work it out by logging out in front, its ok

Check your console whats there