I posted this in the other thread. For me it tends to while mild usage. I understand while charging but not when its not
The processor is running at all times. Then you also have to take into account screen brightness. With my phone's I notice the amount of time to heat depends on the screen brightness. The brighter the screen the faster it gets warm.
I had a few hours today when it was warm just sitting in my pocket while in meetings with the screen off, etc... it may have been busy sync'ing emails, but shouldn't have been working too hard yet was definitely warm. Had to take it out of my pocket and set it on the table to cool myself off...
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