IPhone 4 - phone blacks out for 20-30 minutes at a time

Is anyone else having a problem with the phone "crashing" to a black screen for about 30 minutes? This happened twice so far. Once when I had hung up from a phone call and the 2nd time when I tried to unlock it. It's happened twice in the last 30 days. The first time I had hung up from a call and it went black. When it came back around on it's own about 30 minutes later it re-booted itself - the apple appeared on the screen. The second time it happened, it was fully charged, I went to unlock it and it went black. It mysteriously came back to life about 20 minutes later when I arrived home and plugged it into the charger. It didn't re-boot this time, it came on again as if it were never off.
Any thoughts on this? Maybe something is misfiring? I haven't dropped it or anything like that, so that is why I am wondering what seems to be happening..
thanks!

You can boot into your Recovery partition by holding down the command and R keys whilst booting. Once there, use Disk Utility to verify and, if needed, repair your hard drive. If the drive can't be repaired, then you know that you need a new hard drive.
Clinton

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