Some good advice there Eric. I would try both of these ideas.
Another idea would be to reset your router (I don't think I saw that done yet). There should be a little button in the back of the router that you would press using a paper clip. Hold it down for about 10 seconds. After it reboots, see if you can connect the AA.
Still another option worth looking into. This could be a perfect opportunity to upgrade to a new router. The D-Link DIR-615 is about 7 years old now (I got rid of my DIR-655 about 2 years ago), and although working fine now could break down at any time (If I get 5 years out of a router I am happy). The new AC technologies are out there now and much faster. I don't think the AA connects at AC speed, but most other new devices do. Replacing your router should allow the AA to connect since it would be a fresh start, and all devices would need to be reconnected to the network.
I am really hoping you get this worked out soon, for your own sanity
