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. Plugged Netgear router into Time Capsule. Directed ios6 devices to Netgear, works fine. Direct to TC, doesn't work at all. THE PROBLEM IS RELATED TO TIME CAPSULE.
reply to JNB 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.