Weird Connection Issues

I've had this problem also. When the WiFi connection was lost (I left the area) the AT&T data connection would not always take over. All data would stop. So, for the past 4 days I have left WiFi turned off. In this condition I haven't had any loss of data. The AT&T 3G (can't say 4G with a straight face) has stayed connected.

I'm now getting ready to turn WiFi back on and see if the troubles return.