Try these things:

1. Tip: Purge the Downloads Queue!

2. Keep your shared file tally to 2,000 or below. Are you using an external device to share files? If yes, the problem might be related to this. I had problems with sharing from my external drive.

3. Try deleting your LW Preferences folder whilst LW is closed; instructions here: Point #2 & 3 in Fixes for Limewire (sample image included at bottom of page.)

4. Try the other steps in the link above. Remove all earlier versions of Java & reinstall using the latest version. But only install usng the "Offline" Java installer which is about a 16 MB download.

5. Don't use the Resume/Find Sources on all your currently downlding files at once. If you use this function, apply it to only 1-3 at a time.

6. Defragment your computer hard disk drives. And use a file utility to check there's no problems with any files on your system or with directories & folders & drives, etc.