Just joined, been reading this thread for a while now. I've sent my SN, hope it helps.
I also noticed some other problems with the router, in addition to it going unresponsive after 24 hours; I've got a new DOCSIS 3.0 modem, a SB6120, and I ran a few tests with it.
With the router connected, speedtest.net connected to San Jose, CA gets about 26 Mb/s.
With the router disconnected, and a line going straight to the modem, speedtest.net reports 32 Mb/s.
Upload speeds are also affected, with a change of about 3 Mb/s.