[Rufus]

This is definitely an issue that I have experienced... When I take the bus tunnel out f Seattle, I enter roaming in the tunnel and get 8 miles out of downtown sometimes without my phone coming out of roaming.

I have been working on my phone and I replaced the battery and haven't really seen a problem with this since. Its only been about a week, but if your battery is not up to par, you may want to start there. Its worth a shot if you have an extra battery or can trade someone for a few. I'll let you know if I see the issue again now that I have a new battery.