Why are you so disappointed? Hardware malfunctions do occur. Even with a fraction of a percent of malfunctioning phones, given the number sold, still means hundreds of phones will be faulty.
Honestly, there are far more important things in the world to worry about. You're getting yours replaced. Move on.
I'm sorry but I thought this was a forum about Apple products. Yes, there are more important things to worry about but that doesn't mean that I can't be disappointed that my phone had a malfunction. While on an Apple forum, I feel that I should be able to discuss how I feel about a certain Apple product. And yes, I am getting mine replaced but you didn't answer my question that I asked. I know that I am getting it replaced and the problem will be solved but my question was does anyone know what the cause of this may be or if anyone has experienced this before. If you read my post, you will see that I said I am very happy with the way Apple handled it, but it is disappointing to have this happen to my new phone. I don't appreciate your post and it had zero helpfulness. Maybe you should realize that while on a forum about Apple products, even though they aren't the most important things in the world, people will discuss their issues with these products and yes, some will even be disappointed. Deal with it.