Yesterday while sitting in my LR surfing using 3G while charging my iPad, it suddenly shut down with an overheated shutdown message. It didn't feel hot in my hand, just warm like always. I restarte it immediately and it came back on as if nothing ever happened. Have had it since 3/16 without getting an alarm or shudown. Has this happened to others? BTW I did a search and found where someone had an overheat shutdown while sitting in the sun in 2010!