Motorola Atrix 4G :: In "E" (2G), Missing Incoming Calls?

This problem has gone on far too seriously by half I am sure. And, I have a slip-noose hanging in the basement..On or around Easter (perhaps when 4.1.83 came out?) I became subtly aware I was missing incoming calls. (People would get two rings, then my voice mail, but I would get NO indication of a missed call). At first I figured it was just a dead spot issue. But as it became more pronounced--I started getting death threats from close friends--I began to suspect a problem.After hour upon hour of time spent with AT&T support, I have figured out what the issue is, just not what the cause is. When my phone shows a data transfer, I miss calls. Here are the facts:1. The problem persists on the "E" or 2G network, which is native to my locale.2. It mainly manifests itself between approximately 0700 CST and 1600 CST; during these hours I see the data arrows, after that, the go away.3. During this time frame, the Atrix shows an "E" and an up/down arrow that is almost continuously black or active.4. Moving into an "H+" or 3G area resolves the issue.

5. On WIFI, the issue does not manifest.6. During this constant data transfer, the phone heats up and battery life is shortened.. I am pretty sure the phone did not do this when I purchased it in February.8. AT&T Tech Support is flummoxed. So much so, they say they cannot understand what could cause this.9. Engineers have been assigned to the issue.10. I can place calls with impunity.AT&T sent me a new phone, and stock out of the box, it did the same thing. At first, they thought perhaps some after market app was causing a constant data transfer, and the phone was (incorrectly) failing to cut that data stream when a call came in. But even after numerous factory resets--and no added apps--the new phone did the same thing.

After tech support assigned my issue to the engineers (he speculated a switching issue was causing the trouble, outside of the device itself?) I've had about two days of better service. Now, if I am, say, downloading an app, I miss calls. Or, if I update a weather RADAR app, I miss calls. And it seems that, sometimes at least, after something downloads, the phone shows a continued data UP/DOWN indication. But if I switch to airplane mode for a sec, then back, the data transfer stops and I can get calls.I have yet to hear back on my trouble ticket, but wanted to post this hear to see if anyone else is having an issue receiving calls during data loading. It sure seems like it began around Easter. I wonder if the 4.1.83 update could have caused it?