Network cable unplugged

[K Bland]

I have a computer which is wired to a 3com wireless router
My laptop is using a wireless connection
When browsing the internet I have no problems at all from either
machine. However, as soon as I go into Shareaza, I continually get the
pop balloon stating that a network cable is unplugged, and then a
second later a message saying that the cable is now connected.
If I then shut down Shareaza, it never appears.
Any ideas anyone
Thanks
Kevin