T400: Internet does not work when switching networks unless reboot?

Hi everyone,
I can't seem to establish an internet connection when I switch networks (e.g., internet at work, then at home). It gives me an error saying "limited connectivity" or failed to renew IP. This happens for both wired and wireless connections.
I tried turning off the firewall (comodo internet security) along with the windows firewall. I tried letting windows handle all my internet connections. Yet the error still happens. So I just have to simply reboot my laptop, and everything works 100%.
I never had an issue like this with other laptops. Could this possibly have something to do with some of the bundled Lenovo software? I disabled most (if not all) of them since I barely use them.
Thanks for your help. This is my 1st thinkpad, and I'm enjoying it so far.

Hi gatorman1122,
I had a similar problem with my T400. What wifi card do you have installed?
I had an Intel 5300. Networking was OK with XP Pro installed, but messed up with either Vista Ultimate 32-bit or Vista Business 64-bit installed. All were Lenovo OS images. I tried 2 different 5300s.
I only saw the problem with wifi, but basically if I changed access points or changed from wired to wireless, the first attempt to use the (new) access point would fail to get an address. An immediate reboot would cause it to succeed.
I finally got the issue escalated to a 2nd-tier tech. He sent me a 5100 to try. That fixed it. I doubt it is a hardware issue. It is most likely a Vista/Intel/Lenovo software issue/conflict. IMNSHO, ThinkPad wifi w/Vista is a mess. One of the most fundamental laptop features should work much better than this. Many folks have T-series wifi problems and Lenovo seems to be ignoring it.
Just to add to the excitement, I told a friend buying two new T400s to order 5100s to avoid the problem. He did, and got the machines with XP installed. They both exhibited the same bad behavior Once he updated XP and all the Lenovo stuff, they started to work OK and have stayed OK. Grrrr.....
Z.
The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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