I'm using DWA-125 with the DIR-601. I dunno why it's doing this. It says it's connected, but I can't go on the internet. Only for a minute or two, then it can't load pages anymore but it still shows that it has good connection.
I took a screenshot of it. Look at how the webpage doesn't load and the "good" connection on the bottom-right corner.

If I need to provide more info, just ask. I really wanna make this thing work without returning it.