Well, a couple more people chimed in and I'll add my experience from the past 48 hours.

I finally did a reflash of the Nokia 770 (not an 800) and that solved the problem! I was pretty happy for about 36 hours as it worked like a charm again. I downloaded and installed some apps, configured my system, and was generally enjoying life with this toy again.

BUT, the dreaded problem has cropped up once more. I agree that it is not a Wi-Fi issue anymore (guess I should retitle the thread?). But, this time, I cannot access Internet radio, email, Mapper, or the Internet -- anything external to my LAN. I can access intranet sites such as my router's configuration page, remote desktop to a server in the house, Canola talking to a media server in the house, etc.

So, somewhere along the way....either in the 770, router, or modem, I am getting messed up. Like I said before, I did a factory reset on the router and I did a "factory reset" through the configuration page for the modem, but this didn't work. The only thing that fixed it before was a reflash of the 770. Thus, this tells me that it must be something in the 770....or some incompatibility between the 770 and the other components upstream.

The only thing that I can think was common to both this time and the last time it happened was at the moment it flaked out, it was doing a lot of data transfers and got hung up. This time, I was using Mapper and had the Internet radio going in the background. And, it got hung up to the point that I just shut down as much as I could and then restarted the 770. So, perhaps I am leaving it in a "bad state." I just wish I knew what I could do to "clear" the IP stack or whatever is going on here.

(By the way, for the other suggestions made....I had already tried assigning manual IP addresses [including DNS] to the 770 to see if it would work again, but no go.)