Have you seen this?
Then you may be using your iPhone outside its recommended operating temperatures. Apple has put up a few handy hints to keep your iPhone from getting too flustered.
Apple said:Some conditions and activities that may activate the Temperature warning message:
- Leaving the device in a car on a hot day.
- Leaving it in direct sunlight for extended amounts of time.
- Using certain applications in hot conditions or direct sunlight for long periods of time, such as GPS tracking in a car on a sunny day or listening to music while in direct sunlight.
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"listening to music while in direct sunlight"?
More comments at the Guardian

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