It'd help if you provided your OS vrrsion, connection type, & all those specifics that help a doctor to know to prescribe you an asprin instead of amputating your leg. Or was that brain surgery. lol Try deleting your LW preferences & see if that makes any difference. You will need to reset your options after deleting the prefs. They can be found somewhere about here:
OS X: /Users/your_username/Library/Preferences/LimeWire
Windows: C:/Documents And Settings/your_username/.limewire
Linux: ~/.limewire
And delete the folder called .limewire