AT&T Internet Features

I haven’t been able to connect to any LoL games on the LAN server for three days now, this just happens on LAN server, riot hasn’t report any problems with their servers, so I wonder how can I solve this problem?

I’m having trouble finding how to change the names of my channels to two different names… the 2.4ghz and 5.0ghz

I turned off the WiFi on the provided att modem/router because it couldn't push the signal out to the entire house.  So, I bought a netgear nighthawk router and that seemed to solve the issue.  Now, for about a week or two so far, the router looses the connection from the modem (yes, it is wired to