Mac posted here that there is a memory leak and that is my view as well check out his post. I do firmware for a living and I was able to roll back to 1.10b ftp://ftp.dlink.com/Gateway/dir825/Firmware/ and it has stopped the freezing of the router for now. I'll try a backup to see if I have issues.
Let me know if you able to do this too. The force commands in tftp do not work in unix, it just hangs if I use anything other than the beta 1.10 or the 1.11 firmware.
I'm going to take this to work and let some of the old salty engineers hammer at it and perhaps they will find a way to force the lower firmware again. And, yes I'll take notes.
Night, Jason