The dd-wrt firmware seems having a bug on my router, which made the home network down frequently (due to router reboot) over last 2 nights.
I tried to upgrade it to latest SP1 which supposed to fixed the bug, I was too happy when I found the firmware, so I update it using remote terminal...
I uploaded the full version (I use mini version before), after upload, the router failed and seems hang.
When I back home, seems the router is "bricked"...
After finding some information, I use "boot wait" time and tftp to reflash the firmware, it works now, see if there are any reboot tonight. Hope me good luck.