I have been using Windows 7 since the RC came out and have the same annoying issue where my laptop will lose it's ip address ether wired or wireless. I did notice that it happens if the machine goes to sleep or is network idle for an hour. Which happens to coincide with the DHCP lease time expiration settings we use. If I renew the ip address all is well.
I have turned off all power saving settings, updated the driver
as much as I can.
Is anyone else seeing this issue?