E51 and now E63 shut off during VOIP calls

I have an E51 that I have been using almost exclusively for VOIP calling since I bought it 18 months ago. It was purchased in the US, but most of the time I used it in Thailand. About 3 months ago I returned to the US and started having problems with the phone shutting down and resetting itself during VOIP calls over WiFi. It never did this in Thailand. I tried replacing the battery and updating the firmware but it made no difference. After a few minutes the phone starts clicking, and then after another 10-15 seconds it powers down and then powers itself backs on without going through the full startup procedure. Obviously it hangs up the call, which is extremely annoying to say the least.
Since it is out of warranty at this point I decided to buy a new phone, an E63. However, the brand new E63 does exactly the same thing.  This is really a big problem and I don't understand it. There is no way I can send it in for a warranty service as then I would be without a phone entirely, and actually I'm in Brazil right now anyway.
If anyone has experienced a problem like this please let me know. I was going to have everyone in my company use these phones, but with this problem it would not be possible. 
 Thanks for any help,
David 

The irritating shutdowns occur whether or not the battery is fully charged, whether or not the phone is plugged into the charger while calling, and whether or not automatic login for WLAN networks is enabled. 

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