Something weird just happened. I am at home where I am on my WiFi connection. The Wifi has been working fine ever since I got the phone. I checked Gmail using the app and it was trying to fetch all the messages. Then I saw that the WiFi had disappeared and the H symbol was there in place. I checked the WiFI settings and found the phone connecting, authenticating, then disconnecting from the network cyclically. After a few seconds, I turned off and then on the WiFi and it latched onto it fine. I think this is the second time this has happened. I don't know the trigger.