Keep in mind how torrents work. Those hosts may not have the complete file. You were probably downloading as they were. This is often a problem when the person(s) with the entire file are not online or else their upload slots/bandwidth is peaked & you cannot connect directly to them, only others with part of the file. So near the end of the download, speeds drop, hosts drop, etc. Same applies on gnutella network actually with partial file sharing.

But yes, some torrent programs have advanced settings that disallow hosts from downloading from them if their share ratio is lower than a certain %. Unfortunately LW does does tell you your share ratio.

Patience can be a virtue. As with many others, I use an alternate torrent program; Azureus.