Gateway+AP ... radio on AP stops even though GUI says it is on

I have two TomatoUSB routers, one gateway and one AP. Their configuration is listed below. The problem I am experiencing is that the radio on the AP stops after several days of uptime despite the GUI indicating that it is indeed on. I know it stops because none of my devices are able to see the SSID nor connect to it. Rebooting the AP solves the problem. I see nothing in the logs on the AP to indicate a problem. Perhaps I have it misconfigured?

Details---
Gateway (192.168.1.1) =...

Gateway+AP ... radio on AP stops even though GUI says it is on