Firewall playing up after limewire closes

[Aussie86]

Okay, i've looked on here and can't find anyone else with this problem.

Once i close Limewire Pro (4.2.6), i constantly get messages from my firewall saying "A remote System is attempting to access your computer", then it lists time, date, IP address of computer trying to get access to the computer, and it gives an option to allow, block or manually configure the access from the computer. This happens about once every three minutes once i've closed Limewire Pro, and never any other time, and it's always from a different IP address, and it's always UDP (inbound) protocol.

I've checked the firewall settings, Limewire has permission, and the port for Limewire is open.

I'm running....

Windows XP Professional with Service Pack 2
The latest version of "Norton Internet Security" (Norton Firewall + Norton Anti-virus).
I have a 256kbps ADSL connection on a Speedtouch 530 external modem (Australian model as far as i know)

It's damn annoying and it only happens after i close Limewire Pro.
I have tried Disconnecting from the network before closing LW Pro, and i've tried pausing all my downloads and cancelling the uploads manually before closing LW pro, but nothing happens.