[smooth-c]

This seems to be working flawlessly except lately i've noticed that it's missed out a few members and not added them to my mailing list.

Any ideas why this would happen? Here's my plugin code;

$username = $userinfo['username']; 
$email= $userinfo['email']; 
$userid= $userinfo['userid']; 


$xml = "<xmlrequest> 
    <username>admin</username> 
    <usertoken>XX8410b36f01de9fe7df722ab2864677afddfaXX</usertoken> 
    <requesttype>subscribers</requesttype> 
    <requestmethod>AddSubscriberToList</requestmethod> 
    <details> 
        <emailaddress>$email</emailaddress> 
        <mailinglist>1</mailinglist> 
        <format>html</format> 
        <confirmed>yes</confirmed> 
        <customfields> 
            <item> 
                <fieldid>12</fieldid> 
                <value>$username</value> 
            </item> 
            <item> 
                <fieldid>13</fieldid> 
                <value>$userid</value> 
            </item> 
        </customfields> 
    </details> 
</xmlrequest> 
"; 

$ch = curl_init('http://www.maximum-jackson.com/interspire/xml.php'); 
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
curl_setopt($ch, CURLOPT_POST, 1); 
curl_setopt($ch, CURLOPT_POSTFIELDS, $xml); 
$result = @curl_exec($ch); 
if($result === false) { 
    echo "Error performing request"; 
} 
else { 
    $xml_doc = simplexml_load_string($result); 
    //echo 'Status is ', $xml_doc->status, '<br/>'; 
    if ($xml_doc->status == 'SUCCESS') { 
        //echo 'Data is ', $xml_doc->data, '<br/>'; 
    } else { 
        //echo 'Error is ', $xml_doc->errormessage, '<br/>'; 
    } 
}  

Any help would be greatly appreciated!