无法连接到www.googleapis.com端口443:无法访问网络

我正在使用这个库从wordpress网站获得Youtube的视频和直播。https://github.com/google/google-api-php-client

在过去的一个月里，代码运行良好，但突然开始出现随机连接失败错误（10次尝试中有2次失败，其他都很好）

这是我收到错误的代码：

function googleapis_get_live_event_widget(){
    //Youtube Videos and Live Events
    require_once( get_stylesheet_directory() . '/lib/google-api-php-client/src/Google/autoload.php' );
    $GOOGLE_DEVELOPER_KEY = get_field('cce_api_google_developer_key','option');
    $client = new Google_Client();
    $client->setDeveloperKey($GOOGLE_DEVELOPER_KEY);
    $youtube = new Google_Service_YouTube($client);
    try {
        $islive = get_field('cce_live_event','option');
        $opts = array();
        $opts['channelId'] = get_field('cce_api_youtube_channel_id','option');
        if($islive) {
            $opts['eventType'] = 'live';
        }
        $opts['type'] = 'video';
        $opts['maxResults'] = 1;
        $opts['order'] = 'date';

        $live_videos = $youtube->search->listSearch('id,snippet',$opts);
        $data = array();
        $data['live_events'] = $live_videos;
        echo Timber::compile('partials/live_event_widget.twig',$data);
    } catch (Exception $e) {
        $error = array();
        $error['message'] = $e->getMessage();
        echo Timber::compile('partials/error.twig',$error);
        return;
    }

}
add_shortcode('googleapis_live_widget','googleapis_get_live_event_widget');

在服务器中通过ssh执行curl -v https://www.googleapis.com会导致尝试失败：

[~]# curl -v https://www.googleapis.com
* About to connect() to www.googleapis.com port 443 (#0)
*   Trying 216.58.216.202... Connection timed out
*   Trying 2607:f8b0:4009:80b::200a... Failed to connect to     2607:f8b0:4009:80b::200a: Network is unreachable
* Success
* couldn't connect to host
* Closing connection #0
curl: (7) Failed to connect to 2607:f8b0:4009:80b::200a: Network is unreachable

当请求很好时，就像这样：

curl -v https://www.googleapis.com
* About to connect() to www.googleapis.com port 443 (#0)
*   Trying 216.58.216.106... connected
* Connected to www.googleapis.com (216.58.216.106) port 443 (#0)
* Initializing NSS with certpath: sql:/etc/pki/nssdb
*   CAfile: /etc/pki/tls/certs/ca-bundle.crt
  CApath: none
* SSL connection using TLS_RSA_WITH_AES_128_CBC_SHA
* Server certificate:
*   subject: CN=*.googleapis.com,O=Google Inc,L=Mountain View,ST=California,C=US
*   start date: Oct 21 22:31:24 2015 GMT
*   expire date: Jan 19 00:00:00 2016 GMT
*   common name: *.googleapis.com
*   issuer: CN=Google Internet Authority G2,O=Google Inc,C=US
> GET / HTTP/1.1
> User-Agent: curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2
> Host: www.googleapis.com
> Accept: */*
> 
< HTTP/1.1 404 Not Found
< Cache-Control: no-cache, no-store, max-age=0, must-revalidate
< Pragma: no-cache
< Expires: Fri, 01 Jan 1990 00:00:00 GMT
< Date: Sat, 31 Oct 2015 11:33:49 GMT
< Vary: X-Origin
< Content-Type: text/html; charset=UTF-8
< X-Content-Type-Options: nosniff
< X-Frame-Options: SAMEORIGIN
< X-XSS-Protection: 1; mode=block
< Server: GSE
< Alternate-Protocol: 443:quic,p=1
< Alt-Svc: quic=":443"; p="1"; ma=604800
< Accept-Ranges: none
< Vary: Origin,Accept-Encoding
< Transfer-Encoding: chunked
< 
* Connection #0 to host www.googleapis.com left intact
* Closing connection #0

此时，如果我运行页面，提要将正常显示。

我应该寻找什么来修复不一致性？