After the first day of having my phone, it would just restart itself. It seems to only do this when I am in the messaging application. I tried to download another application from the market, but I had the same issues. My messages are always deleted, meaning I do not have a lot in my application. I use advanced task killer. I can do anything else that requires a lot of phone power, but the phone still only restarts in the messaging application. I don't know if anyone else is having this issue, but please help 
I factory reset my phone to see if that was the issue, but the same thing is happening.