I'm running a wrt54g v1.1 as an AP with a wrt54gs in node mode. They've run fine for a few days. Suddenly tonight I cannot create a stable connection to the AP. It shows up in the list of wifi connections available. It will connect but then begins a cycle of trying to identify the network, then disconnects, connects, then indentifying again, rinse and repeat.

During the first few moments it hands out a 172.27.0.5 address to the connected computer. Then, after a few attempts identifying the network, it hands out a 169.xxx.xxx.xxx address. When I flip to static ip and assign the 172.27.0.5 address myself, I can view the status page at 172.27.0.2 like normal. 

Is this a problem with the DHCP server? The same thing happens when I use a hardwire connection to the AP via one of the LAN ports. 

I've rebooted the router but still get the same results. Any ideas??