I have seen this happen a few times where if I am updating large files through Windows Update, the MI424-WR Router seems to lose its DNS info and I lose the internet connection. I can still communicate between computers in the house. That is why I think it is the DNS is getting corrupted. It happens a lot more with the VISTA OS than with the XP OS. Anyway I have to do one of two things. I can flush the dns which solves the problem a small percentage of the time (10%? of the time). The other is I turn the router off and on. This works pretty much all of time. Any ideas? This appears to only happen with Windows update and not with any other internet activity. Also, it happen one time with XP but it was downloading a 284M update (full .NET SP pack). The VISTA seems to cause problem after about 30 to 45 seconds into the downloading process. To get around this, I try to update in small batches so I don't have to download a large amount at one time. This seems to work pretty well but it is a pain to have to babysit the computer during the update process. In the VISTA world, the update process seems to be a different process than going through the browser as in XP. Don't know who to contact. I looked on the Microsoft site and got some suggestions but they didn't solve the problem, just reduced the affect.