iphone 5 will not stay connected to wifi

iPhone 5 is the only mobile device I use at home (iTouch, 2 iPads, iPhone 4 all connect and reconnect without problem) that will not have an internet connection after automatically reconnecting to my home network when returning home or after the phone goes to sleep. It connects to the home network, gets an IP address, dipsplays the WiFi sign but will not connect to the internet with Sifari or any other web app even the App Store unless I turn off WiFi and restart WiFi. Renew Lease does not work. Any tips are appreciated.