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Originally Posted by awillimd
I spoke too soon...my problem has returned and no amount of inserting and removing the headphone jack helps. My new theory is that this problem has something to do with excessive heat build up that confuses the iphone. My reason for thinking this is that it only gets stuck in headphone mode after I've played with it for about 20 minutes. If I restart the phone and let it cool down, it seem to return to normal. I've also noticed that just before it returns to normal, the iphone will randomly turn itself on and off about three or four times. Not sure what the connection is but it is sure strange. Basically, I still don't have a fix which renders my iphone useless for normal use. A basic assumption with any phone is that it will predictably ring and allow you to accept and make calls. Without this predictability, it's useless. Very disappointing and not something I expect from Apple. Their silence on this issue is deafening (even on their own bulletin boards!!)
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A further update...I'm now almost certain the problem is related to excessive heat buildup. Last night, after my kid and I played with the phone for awhile, the phone got warm to the touch and slipped into "Ringer:Headphone" mode again. Instead of inserting and removing the headphone jack as suggested here, I held the jack end of the phone into the cold air of my room air conditioner. The phone returned to the the normal "Ringer" mode almost immediately. I again continued to play for another 20 minutes or so until it warmed up again and the phone again slipped into headphone mode. Again, I held it into the cold air stream and the phone immediately returned to normal ringer mode. I repeated the experiment a third time and it did the same. Clearly this is a heat buildup problem that is affecting the built-in thermocoupler that is sending a confusing message to the iphone. This is now in Apple's court. They need to provide a software solution for this or provide free replacements (even for those iphones out of warranty).