3G lost connection issue

I'm using a 16 GB 3G iPhone running 3.1. The phone was new in July 2009 (after being replaced for a bad sleep button).
*The icon shows a strong 3G signal of 4-5 bars. However, I frequently have no connection.* This began early September. The symptoms are as follows...
Phone: Attempts at outbound calls do nothing (display shows "calling," but it never rings). Incoming calls go directly to voicemail. Missed calls and voicemail do not display (no "badge" counts, and nothing updated in those views).
Internet: No connection (Safari, Mail, and internet apps do not work).
Text: Outbound attempts stall, and eventually display a red "!" icon. Tapping this icon displays a message, "Your message was not sent..."
In addition, *the battery indicator does not update* (neither when charging nor discharging).
The connection does NOT restore on its own (e.g., moving to areas of different signal strength). I've tried toggling the airplane mode, but this does nothing. The only way I've found to restore the connection is to restart the phone (via the red slider). Although this restores my connection, the problem reoccurs within a day or so. I've also tried resetting by simultaneously holding the sleep and home buttons. (Push and Bluetooth are both off, by the way.)
I took the phone to an Apple Genius bar, and they recommended resetting the factory settings (via iTunes), and then manually transferring all my data back (NOT restoring from by backup). I did this, but the problem continued, so Apple (very nicely) replaced the phone with a new one. Unfortunately, the problem continued, so it's apparently not a hardware issue. They suggested the next step might be having AT&T replace the SIM card, although they really thought this was a long shot.
A few days ago, I installed the app, "System Activity Monitor" to see if something was hanging, but processes and CPU usage do not show anything unusual. CPU usage floats around 4-7% (with System Monitor running as the top process). Storage has about 1.6 GB free, and runtime memory floats at around 11.5 MB free.
This iPhone has never been hacked in any way.
Any insights?

See my reply in this post above, page 8:
"Unable to make calls, text or go online unless I restart iPh"

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