javascript sometime not work when user not in chrome interface

[nitiphone2021]

I have a chat system, admin and guest chat.
on Admin. After Login I created javascript to send ajax every 5 seconds to server to update status online
on guest also.
My problem is admin login on chrome and they go to another software or do another work but still login to chrome.
sometimes I found javascript or ajax not send to server

    setInterval(function () {

    fetch_user();

    update_chat_history_data();

}, 5000);

Any way I can update admin status after they login and go another software or interface

[requinix]

Browsers may throttle background activity when users are not active on the page.

Switch to WebSockets instead of AJAX polling.