Reboot at least 1x per day 3 AP's 1 Router

I have a wireless Network that I am (defacto) in charge of at work.

Approximately one time per day the network death spirals to the floor. ping times escalate from their average of 48.7ms to 2,000+ ms continuing down from there. The network finally becomes non-responsive and everything has to be reset.

I would like to try and understand what is happeneing as well as fixing it. What logs should I start looking at? What would possibly tel me what is going on. A breif description of the network is below.

The network contains 3 wireless access points. They are D-Link DAP 2553's set in "Access Point" mode. Each of them is wired into a WRT54GSv1 Running DD-WRT v24-sp2 Mega. Two of the access points are in the front area of the office. One is set to 5GHz wireless N channel 165, the other is 2.4GHz a/b/g/n on channel 11. The third access point is through a wall and approximately 90 ft away. It is 2.4GHz a/b/g/n on channel 6. All Access points run at 50% power.

The DD-WRT router handles being the Gateway and DHCP server.