That's what I was thinking...hitting an LTE only tower and losing 3G/1x is a possibility - where I live there is no 3G or 1x but I get B41 from a nearby Clearwire conversion. So when I'm leaving my house, sometimes my iPhone picks up Verizon 1x and it shows extended LTE even though I'm connected to sprint LTE and Verizon 1x. This could be the problem considering he is using an iPhone...