My iPad has worked flawlessly with my home router since I got it six months ago but now, suddenly, every app says there is no internet connection -- even though it shows that it is connected to the router. Even more curious, my iPhone continues to connect to the internet through the same router. After I couldn't get a connection at home with my iPad, I went to Starbucks and had no problem connecting and going online via WiFi. Then when I got back home, iPhone works and iPad doesn't. Any ideas?