Tablet will not connect to contoller

[Pat Drone]

I was in the hospital for 2 months and had not flown for 4 months. So I got my drone out and my Nexus bot when I connect to the WiFi on my tablet it states no internet connection and my controller shows disconnected but if I bring it into the house with WiFi it connects. The same happens with my I pad. It will work with my cell phone. What I am doing wrong or what tablet works best. I use the tablet with my Phantom with no problem. Thanks