paypal 支付问题

这是封装的方法：

private function _connectByCURL($url, $body, $http_header = false, $identify = false) {

    $ch = @curl_init();

    if (!$ch) {
        $this->_logs[] = $this->paypal->l('Connect failed with CURL method');
    } else {
        $this->_logs[] = $this->paypal->l('Connect with CURL method successful');
        $this->_logs[] = '<b>'.$this->paypal->l('Sending this params:').'</b>';
        $this->_logs[] = $body;
        for ($attempt = 0; $attempt < 3; $attempt++) {
            @curl_setopt($ch, CURLOPT_URL, 'https://' . $url);

            if ($identify) {
                @curl_setopt($ch, CURLOPT_USERPWD, Configuration::get('PAYPAL_LOGIN_CLIENT_ID') . ':' . Configuration::get('PAYPAL_LOGIN_SECRET'));
            }

            @curl_setopt($ch, CURLOPT_POST, true);
            if ($body) {
                @curl_setopt($ch, CURLOPT_POSTFIELDS, $body);
            }

            @curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
            @curl_setopt($ch, CURLOPT_HEADER, false);
            @curl_setopt($ch, CURLOPT_TIMEOUT, 30);
            curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 20);
            @curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
            @curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
            //@curl_setopt($ch, CURLOPT_SSLVERSION, Configuration::get('PAYPAL_VERSION_TLS_CHECKED') == '1.2' ? 6 : 1);

            @curl_setopt($ch, CURLOPT_VERBOSE, false);
            if ($http_header) {
                @curl_setopt($ch, CURLOPT_HTTPHEADER, $http_header);
            }

            $result = @curl_exec($ch);

            if (!$result) {
                $this->_logs[] = $this->paypal->l('Send with CURL method failed ! Error:').' '.curl_error($ch);
                if (curl_errno($ch)) {
                    die(var_dump(curl_error($ch)));
                    $this->_logPaypal(curl_error($ch));
                }
                sleep(1);
            } else {
                $this->_logs[] = $this->paypal->l('Send with CURL method successful');
                break;
            }
        }



        @curl_close($ch);
    }
    return $result ? $result : false;
}

调用这个 paypal nvp 接口时不时就报这个错误 OpenSSL SSL_connect: SSL_ERROR_SYSCALL in connection to api-3t.paypal.com:443 ，或者 SSL connection timeout ，或者 OpenSSL/1.1.1u: error:14094438:SSL routines:ssl3_read_bytes:tlsv1 alert internal error ，是什么原因导致的啊，导致网站支付经常跳转失败