Chances of iPhone catching fire
I've heard of few very rare cases where iPhones have spontaneously caught fire. If mine freezes at times, often shutting down/restarting, or often acts slow, is there any danger of that?
Basically, what chances are there of an iPhone malfunctioning and catching fire? Am I just being way too overly paranoid?
Thanks
iPhone 4 (8GB), iOS 5.1.1