K cancel the file from the download window & also delete it from the incomplete folder. Then open the original torrent seed with Azureus.

I don't know about LW, but I do know that with Azureus, if your share ratio is below a certain amount such as 0.75 then the download may stop & just before that slows down incredibly. So making sure your ratio is up high is important. For LW I don't know. At least with Azureus you can change your options for how many to connect with, upload & download speeds, etc.

Also time of day can play a part, also some days are better than others. You may be waiting for someone else to download that extra bit & in the meantime you are sharing off them, etc.