There's one explanation here.
http://www.gnutellaforums.com/showpo...1&postcount=17

What version of LW are you using? The same kind of thing happened recently here
http://www.gnutellaforums.com/showthread.php?t=68961
Try using a different version of LW & see if the same thing still goes on. Could be a bug?

Is it happening with heaps of files? Has it always happened, or just started recently? If it's not a bug, I'm really not sure why this would happen a lot, maybe an overly aggressive firewall?? Sorry I can't help more, give us your system details & it might help someone else to get more of an idea what's going on.
System details - help us to help you