Are they torrents or regular gnutella video files? Which version of LW are you using?

It's not uncommon when downloading a large video file that hosts drop off as you near the end. Sometimes this is because not all of them have 100% of the file. Usually when files stop at a high download % it's because you are waiting for the last bits of the file from someone with 100% of it. You may have been downloading from someone who themselves did not have the entirety of the file but were downloading from someone else. Re-search the topic to find the file in search results again. This sometimes helps find more sources. If using LW 4, you could cancel download & reselect the download from search results which sometimes pushes it to start again. LW 5 cannot do this as canceling a download deletes the incomplete file. Alternatively if using LW 5, pause & unpause might fix it.