D-Link DIR-825 :: Connected But Internet Drops Off?

I have the A1 version. I originally bought it and used it for a few months. I was very disappointed with the performance and went back to my Linksys WRT54G (running DD-WRT).

I recently decided to try it again. I upgraded to firmware 1.13. It worked pretty well for a week or so but now I am considering going back to my Linksys again. I keep losing my internet connectivity. The signal can be strong but internet becomes unavailable. Sometimes, just waiting it out works. Sometimes, disconnecting and re-connecting works. Sometimes, a reboot of the router works. Sometimes, nothing seems to work until it is good and ready to work. Sometimes, I cannot access the internet on my computer but my girlfriend still can. Sometimes, neither of us can connect.

I want to use it because I want the wireless-N speed to transfer files to my media center (and I paid a lot of money for it!) but the aggravation is getting to be too much.

There seems to be some correlation between visibility of my neighbors' networks and the connectivity issues but I could not swear to that. This is amazing to me because my neighbors are pretty far away and I can barely get the DIR-825 signal from my basement to my second floor.