It's best if you both are not too busy uploading & downlding at that time. It also helps if you both have Chat enabled. See: 
http://www.gnutellaforums.com/showth...threadid=30911  
If you are both firewalled it can cause problems. You should BOTH do this test (after LW's been open for at least 30 mins): 
Bug Report instructions & sample image  If it's True then that's fine. But if it's False, then there's a firewall somewhere causing issues. It may be an internal firewall or a modem/router firewall.