I'm not sure exactly from where the issue is coming, but my netgear DGN2000 is not working correctly. Having issues to work wirelessly with my Macbook. Tried also to use cable the same result. Now I use old linksys and it seems to give less headaches.
When I have time I wil try customised firmware for netgear to see if issue goes away:
Here it is: http://jake-tm.co.uk/?page_id=259