Three or four times a day the radio module in my iphone doesn't responding. Sometimes it happened during a phone conversation, sometimes without any reason during a day.

I have a problem. I use my iphone4 during one year. I bought it with firmware 4.0.2. Three or four times a day the radio module wasn't responding. Sometimes it happened during a phone conversation, sometimes without any reason during a day. Just I was out of connection for incoming calls. But it happened without any warnings on my iphone. After I have upgraded firmware to 4.1, this problem disappeared (baseband 2.10.04). But a week ago I upgraded firmware to 4.3.3 and my problem appeared again (4.10.01). I changed SIM-card, but it didn't help. How can solve this problem? I want to downgrade baseband to 2.10.04. Are there another solutions?

    Hi ZachBrunelle!
I'm saddened that your having trouble with your device and you efforts are  greatly appreciated, let's get to the bottom of this! You mentioned your device not having any physical damage, has it been exposed to anytime of water/moisture?

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