After backing up your phone, Settings->General->Erase All Content and Settings.
Then set up as a new phone.
DO NOT RESTORE from backup as you may be bringing the problem that was causing the overheating back on your phone.
Slowly add your most favorite apps from the App Store, waiting a day or so to make sure your problem isn't caused by a bad app.
If this doesn't work, take your phone to the Genius' for a new battery/phone.
BEWARE. When you backup your phone, it isn't that easy to get to some of your important data like documents in your favorite programs or photos if you are not using photo stream so pull those out of iTunes.
It seems like it's a known bug of 6.0.2. I wonder how long it will take to fix it!!
No, it's not a known bug for any version. It's a runaway app that is sending or trying to send data and failing, and looping trying. And it's been reported periodically for 5 1/2 years. And it will never be fixed. You have to fix it yourself by following the advice that has been posted innumerable times in these forums.