It sounds like you keep pulling fake hosts...After you have tried the new host tip and if you keep seeing the same IP numbers appearing try adding them to your Host Filter....
Tools > Options > Filters and select the Host Filter and add these IP's into it and select apply...
Then install PeerGuardian, it will help keep the fake hosts out...Remember to enable PG just before you start limewire up...
Phoenix Labs » PeerGuardian 2 If you're using Vista, there's this PG2 Beta available for Vista users. PeerGuadian 2 for Windows Vista beta released - Phoenix Labs PeerGuardian 2:Manual - Phoenix Labs Wiki
Another thing if you are using limewire 4.13 and later you can apply this hostile list...This will block known fake IP addresses...
The TechNutopia Fullsize Hostiles List for BearShare and LimeWire