This happened to me when I moved out of range of wifi. I assumed that it was because a cell signal wasn't available to transfer. I'm still testing to see if it repeats.
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I've been having connection issues lately, too. I either have to restart the connection in the Manage Connections screen or I have to do a battery pull. Sad to hear this is a regular occurrence. :-\
this happened to me in an know are of bad or no signal, i guess the phone links to other carriers signal for sos (emergency) calls only, so in case of emergency you can always use the phone