Port forwarding (opening port 6346 for LW) might help. I have instructions here but don't know if they are exact for your model. The principle will be the same. So if you choose to do this the instructions are below.

1. You will need to set up a static ip 1st for this to work! 2. Instructions: http://www.portforward.com/fujitsu/ap-600rp-usb.htm & use Port 6346.

3. Force ip within LW using Port 6346: Force IP instructions & sample image

4. Try the Beta 4.3.3 which overcomes some major bugs in 4.2.x: http://www.limewire.com/english/content/beta.shtml or if you're a Pro user you'll find a link at the bottom of your personal downld page.