I talked to Samsung a few weeks ago and they said that this issue is a known issue and it seems to be caused by a script or coding that interferes with the 3G/4G handoff and causes the phone to lose signal when waking from idle or in just random areas. They are working on a patch that will be pushed to all of the phones, including the ones that don't have any issues, to hopefully fix the problem. When I talked to him he said we were looking at the end of August to get the update.