These forums are locked and archived, but all topics have been migrated to the new forum. You can search for this topic on the new forum: Search for FTP Service Quits, Especially After Backup on the new forum.
We have experienced an ongoing problem of FTP service quitting, typically over a weekend which is also when we perform our major offsite backups to Amazon.com. A restart of the server corrects the problem, but surely there could be a fix or a way to track down the problem's origin. We are hosting at Linode.com