FileSystemWatcher and FTP Folder

I've a windows service application that monitors XML files creation in an FTP folder (ftp server), I'm using FileSystemWatcher(FSW) (C#) object, it works fine mostly but sometimes its Created (fsw_Created()) event is not raised (throwing no exceptions). So I miss those file for further processing until I restarts the service and FSW picks up missing files again.



Any help/ideas to resolve the issue.



Thanks and Regards