No luck this weekend, fiddled with ACK settings on numbers MacBooks, multiple restarts of modem. IDevices would occasionally work for a few minutes then go dark. As far as I'm concerned, there has NOT been a fix. I'm calling and canceling today.
Found solution. iOS 6 devices work as long as you do NOT use Time Capsule. I bought a Netgear router and plugged it into TC and it works fine. If I direct iDevices back to TC, they don't work. The TC works fine via FIOS but not when using Gen 4.