I had to change firmwares on my router when I got the 8900. It worked fine with my 8320 but the 8900 threw it for a loop. I figured I was good to go with the Linksys WRT54GS (w/latest Linksys firmware.) However, multiple devices didn't like to stay connected when the 8900 was connected. I had to reboot the router multiple times a day. Went to dd-wrt on it and all has been fine since. There's definitely something different about the UMA on the 8900.