Second Chance wrote:
With Win 7, the issue is most likely an update that installed IPv6 (Internet Protocol Version 6) with IPv4 still installed and running. On some routing devices (such as the Verizon MiFi hot-spots), the router sees the two separate requests for the same IP address from the computer. This was driving me crazy on my Win 7 laptop until I turned off (un-checked) IPv6 in the properties for the wireless connection. Haven't had it pop up since.
Rob
This is by far the best answer yet! Sure hope the OP is running Win 7 and this solves it for him.