Are these files connecting for ages & then showing 'need more sources'? If that's the case, sounds like fake files. Try a new search & vary search terms (for songs, look for artist or album rather than song title. For movies, try actors' names or director's name). Check the sticky below for more info
Fake files showing up in search results

If this is happening with every file (look for a really old song or movie & try modem sources, just as a test)...delete LW's preferences folder when LW's closed. Points 2 & 3 below explain how
Fixes for LimeWire