Debug Random Disconnects on OpenWRT

My fleet of CPEs and access points is running a freshly-updated, custom-built OpenWRT image, and ever since the upgrade the radios keep dropping clients at unpredictable intervals. One moment stations associate, the next they are kicked off and reconnect seconds or minutes later... (Budget: $30 - $250 USD, Jobs: Debugging, Firmware Development, Linux, Network Administration, Network Security, System Admin, Ubuntu, Wireless)