I have a RT-N66U router. I don't think I am getting very good 5ghz performance. I realize 5ghz doesn't go through walls as well as 2.4 but I still don't think it's as good as it could be. I don't think I have ever seen my speed reach 200 Mbps. Occasionally, my connection stops responding and I have to change to another SSID (2.4) and then I sometimes reconnect to the 5ghz N. Can you guys provide some guidance to improve this?