There have been some issues with UMA and the 8900. Not sure why they had it fixed in the 8320 but now have the issue on the 8900. N router compatibility has been fixed with OS 4.5 and one would assume N routers are supported by the 8900. I would make sure you are running the latest OS you can find for the 8900 and make sure your router firmware is also up to date with the latest. If it still has issues after that then it may just be a matter of waiting for a new OS.