I've been having problems lately where my internet connection would go bad after a day or so. I would reset the connecting using the commands
netsh winsock reset catalog netsh int ip reset c:\reset.log
I'd reboot and it would work again. Then I discovered that just rebooting would fix the problem. But the problem started showing up more often. More recently I've found that just disabling and reenabling the WiFi adapter will fix the problem. Finally the problem returns after just seconds. I can check email one time successfully (only if I am quick) then it goes bad again.
I am able to access newsgroups using Thunderbird and the networking trouble shooter finds the connection to be working properly. Email works once in a great while, but mostly doesn't make a connection. FireFox does not even report a problem, it just blinks and keeps the default page up. Chrome will show Google results, but other pages are reported as down. A ping to 8.8.8.8 returns a valid response in 22 ms most of the time, sometimes up to 100 ms.
I've also reset the router and cable modem. Netflix works fine on the Sony box and other users can access the internet.
I am at a loss on how to even proceed troubleshooting this.