I tried looking for this in the forum but didn't find a thread about it. I just experienced something very odd with my iPhone 4... I received a text message and went to check it a minute later. I pressed the on/off button and the screen briefly flickered on then quickly turned off. I did it again and it stayed on this time and it seems to work fine now, for the most part. However, in the brief time that the screen flickered on and off and when I first turned it on for good, I saw the screen saying "Temperature Warning". The temperature warning was only there briefly then disappeared. Like I said, it seems to be working fine now for the most part. I have a 32GB GSM iPhone 4 running iOS 4.1. I plan to upgrade to 4.3.1 eventually. The iPhone was laying flat on a table and hadn't been used in a couple of hours. It was room temperature (~68°F) when I picked it up. No apps were running in the background. At this point, should I be worried and gearing up to call Apple on Monday?