iPhone 5 64gig. Phone was just sitting on my kitchen table, not charging not being used, no apps running. Picked it up to use and noticed it was very warm. Warmer then I have ever felt since I've owned it, even after charging or using GPS. Turned off immediately for about 30 mins. Powered it up and all is well. Has anyone had this problem and do you think its a worth a trip to the Apple store? Doing a Restore now as I know this is the first thing genius will ask. Is there an app that can measure phone temp?