My phone randomly crashed and it won't turn back on. Why?

My iPhone 4 is running on 4.2 software, I believe. It just randomly crashed and after about 30 minutes it hasn't responded. I've had this happen twice before, the first time, I ultimately had to get a new phone. The previous time, it just came back to normal after 10 minutes. What do I do now?

Hard Reset.
- Hold down the Home Button (Circle button with White Square in it)
- Wait for the 'Slide to Unlock' screen pops up
Turn your phone off once a week for about 10 minutes

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