I have been surfing the DLink forum trying to find a stable wireless router since my WBR-2310 is starting to drop my wireless connection.  To my surprise, I find every DLink router seems to be having the same issue.  It appears when anyone upgrades to the latest f/w, the problem starts.  This is not unique to this router, or mine.... but every one.  Check it out for yourself!  I thought I would upgrade to the DIR-655, but noted the same complaints there.  Same with my DWA-552 Adapter....
Perhaps some disgruntled tech has done the nasty with the f/w programs?