So my wireless connection between the two was working fine; when on or about 5/21, I could connect to router, but not to Viera Cast. I ran the test and it would stop at "Acquire IP address from Router." It could not get beyond that. I have no idea why this thing worked flawlessly for almost a year.
After going through the forums, I found a solution:
Go to Network Settings on TV:
IP: 192.168.1.25 (or any number did is within the range, or doesn't conflict with any other devices plugged into your router)
Sub Net: 255.255.255.0
Default Gateway: 192.168.1.1
Primary DNS: 192.168.1.1
Sec DNS: (leave blank)
It worked perfectly and so far so good. I'm fairly new at messing with router things, but this didn't require that I reset anything with my router, just the TV.
Hope this helps someone because I was going nuts trying to figure this thing out.