JebSoftware is asking for another modem log, and a video if possible. They're also wonder when you say, "The phone goes back to normal on its own", how long will it take for that to happen?
1. I can generally reproduce it if I'm either traveling or if I'm in an area with stellar cellular coverage - let's say, right next to a cell tower. At home, it happens sometimes if I'm in a room near a window I think because I have a few cell towers nearby.
2. The phone goes back to normal on it's own, but it's generally as I continue to travel or move within a building to another location. Sometimes the phone does it on its own when it's stationary, but it's hard to say why and not *completely* predictable.