Try deleting LW's preference folder with LW completely shut down. Instructions in this thread points 2 & 3(check both locations):
Fixes for Limewire. This will reset all your option settings, so make a note of them first.
If you have multiple d/loads going at the same time, try cutting back to just one at a time and see if it helps. If it does, then increase the number until it starts doing it again.