Love my new phone. Only issue so far is logging onto WiFi. At home (dual band router and access point with WPA2) set up was easy but my phone cycles between WiFi and AT&T 4g for a long time (perhaps 10 to 20 minutes) after power on or walking into coverage area. Concerned I took it to my local AT&T shop where the tech had a nice new red S3. He logged me onto their network and with the 2 phones side by side they cycled between WiFi and 4g. Any clue as to how to stop the scanning once a network has been identified particularly one with security? Thanks.