I realise it's been long since I posted here, but I basically came to a quid pro quo with my system: I don't do anything more to it, and it basically works. Will soon be switching to Ubuntu instead of XP though.

The firewall I use for the computer running LimeWire is XP's built-in, and I run avast! 4.7 with P2P shield enabled.

This problem hasn't disappeared, I have just learned to live with it.

PS: My connection isn't real stable. It can sometimes go down for some reason. The fix is always: Reboot modem.

I just find it somewhat odd that when I don't loose my web-connection, I might lose my connection with Gnutella as an Ultrapeer. And I don't get reverted back to Leaf. If I am not suited for Ultrapeer anymore because someone that has better connection/computer has logged on and assumed Ultrapeer-status, then it would be preferable to be reverted to Leaf, not kicked from the network completely.

Well, as I am soon getting a new laptop, and replacing Windows on all of my computers, I don't worry too much about this anymore. Have to see if I have to come back later when I have Ubuntu running.