If you have not already tried it, I would recommend doing the following:
0) Backup router
1) Make sure you are on 1.01 firmware
2) Factory reset your router and configure it to basic settings
3) Test to see if the web admin pages are responsive.
See my post "Overcoming DIR-827 Router Trouble Out-of-the-Box". Watch out for the 60 second idle timeout on the web admin pages!
--AquaManiac