mine just did this again last night.. this is the second time it has done this. just sitting there, perfectly normal, and all of a sudden stops working. before this, the battery had kept dying really quickly, and the phone would reject certain cords, like if plugged it in just wouldn't respond, even with some brand new out of the box cords. the solution was to replace the tristar chip, but it looks like now I'll have to go back to the store to see what happened. cheers