I am having an issue with this SA. I have narrowed it down to one thing, when I have cellular data set to turn off during this SA it will lock my phone down and the only way I can bring it back is to hold volume down and power and have the phone reboot. If I change the cell data setting it will not lock out, at least it did not today, but it runs through the battery faster. Is this a known issue? Should I exchange it? I just got this beast on Friday. Thanks in advance.