Shortcut is working fine but freezes AE for a few seconds

Hi, 

I've developed an extension for AE, which was working fine until I updated to the second last version (3 months ago aprox).

In the extension you can trigger a specific function in two ways.

The first one is by pressing a button, the second one is by using a shortcut. The first method is working fine, the second method executes fine but sometimes freezes the software for a few seconds. 

I don't know where the problem could be to be honest and so far I don't know how to find it.

Anyway, the shortcut works like this:

it opens a second extension which runs this code

(function () {
    'use strict';
    var csInterface = new CSInterface();
    var event = new CSEvent("myExtension.copyShortcut", "APPLICATION");
    event.data = "Copy";
    csInterface.dispatchEvent(event);
    csInterface.closeExtension();
}());

The main extension is listening and when it receives the order it executes the callback function.

var csInterface = new CSInterface();
csInterface.addEventListener("myExtension.copyShortcut", callbackCopyShortcut);

Any ideas?

Thanks