My mom has had trouble with a stable connection through wi-fi forever. I finally had her go out and get a new wi-fi router. It's a Netgear Nighthawk. She has Comcast and her own modem (Motorola Surfboard). I restarted the modem and used all the default presets on the router just to get things working last night. Everything connects to the router but has no internet access. I can connect to the internet fine through ethernet though. Any ideas of where to go from here?