My iPhone 4s has been going black and shutting down then restarting itself, why?

Why does my iphone 4s keep going to a black screen, shutting down then restarting on its own???  Just started happening a day ago.  Will I need to get a new phone or can this be fixed?

The Basic Troubleshooting Steps are:
Restart... Reset... Restore from Backup...  Restore as New...
Restart / Reset
http://support.apple.com/kb/ht1430
Backing up, Updating and Restoring
http://support.apple.com/kb/HT1414
If you try all these steps and you still have issues... Then a Visit to an Apple Store or AASP (Authorized Apple Service Provider) is the Next Step...
Be sure to make an appointment first...
allisham wrote:
It has also gotten rid of the "personal hotspot" option....
Trouble Shooting  >  http://support.apple.com/kb/TS2756

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