You could contact Netgear as the DG834 v2 comes with a 2 year warranty. Their customer service is excellent and they will be able to tell you if it is a faulty router (could be a fault in the switch).
I had a problem with my old Netgear router so I phoned them. They sent me a new one by courier so I had it next day. I tried the new one and it worked so I sent the old one back to them.
Before you try, however, have you updated the firmware on it? There is a new version of the firmware available:-
Make sure you backup your settings (ADSL login, WEP/WPA, etc) before updating the firmware.