Sailfish WebView: Signal LinkClicked sleeps sometimes

The signal “LinkClicked” does not fire sometimes. Here an example (from SDK Help):

import QtQuick 2.0
import Sailfish.Silica 1.0
import Sailfish.WebView 1.0

ApplicationWindow {
    initialPage: Component {
        WebViewPage {
            WebView {
                anchors.fill: parent
                url: ""
                //url: ""
                onLinkClicked: {

When clicked at a pic the new page is loading. But the signal “linkClicked” is sleeping well.
For the second url, the signal works.
Tested with Javascript on or off. SDK target is EA-armv7hl