This is a theory and you can take it for what its worth

I have two wireless routers - Linksys WRT54G w/hyper wrt and Netgear WGT624v3

Have N810 for a week tomorrow - always connects to linksys but netgear was iffy - got the (unable to retrieve ip) error a lot lately. Just updated firmware on netgear and problem went away - at least for now.

So the question is - Has this occurred on other than netgear? seems like a lot of reports of netgear problems. Just a thought.