I've noticed that with WZR-HP-G450H running the default dd-wrt firmware (from 5/2011) experiences a significant slow-down in both the interface and internet speeds after running for more than 2 days. This occurs when I'm running in client mode as a repeater.
A simple reboot seems to fix the issue until an inevitable slow-down after a 2 day uptime. To resolve this, I went to Administration>Keep Alive and set a scheduled reboot everyday in the wee hours to prevent future slow downs. Have other users experienced this issue? Any way to report this to Buffalo or DD-WRT for future fixes?