dont know if anyone that has a n900/ea4500 has this issue...about everyother day or so, I need to bounce the device...all the devices can get to the routers page with an issue, but not pass...I have seen this on my laptop with hyperV, VMware, etc along with other systems...its not out of IPs, and its not even close on bandwidth...
as a test I have a E2000 with DDWRT on it and running that...see if it truly the router or the modem...