I have a Samsung Caliber from Metro PCS. Need help, please.?

I currently have a Samsung Caliber from Metro PCS and i have a problem with it. I've had it for about 4 months and recently its been shutting and restarting itself at random moments. Also, when i press the start button to start it, it loads until its about to turn on then restarts. Any help is appreciated. Does this happen to anyone else? Thanks in advance.
 
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