I have an iP6+ 64GB on AT&T and up until about a week ago, everything seemed to work just fine. Now, for some reason, every 90 minutes or so, even if the phone receives a strong signal, it will bug out somehow and I get "Searching..." instead of "At&T". The only thing that will fix this for me is to delete all network prefs and reboot. I have tried everything else. Has anyone else seen this behavior?