Not sure what is causing your issue, but I am also having wired connection problems.
On my xbox 360 that is wired and less than 2 feet from the DIR 655, I get continuous error messages while trying to stream netflix and it says there are 2 or 3 bars instead of full bars. It's a freaking WIRED connection!!!!!! If I stop the movie or show on Netflix that is playing and start it back up, it will test the connection at fulls bars. but repeatedly tell me my connection has slowed while watching that show or whatever. haha. oh well, won't have this router for too much longer anyways.