Why does my Mac Pro like to restart itself when I opened multiple apps?

I have a 2012 Mac Pro with OSX 10.8.4 and ever snice I brought this laptop it has been restarting itself. Does anyone have any idea why it like to this? It's getting annoying.
Thank you!

SivilayMN wrote:
I have a 2012 Mac Pro with OSX 10.8.4 and ever snice I brought this laptop it has been restarting itself. Does anyone have any idea why it like to this? It's getting annoying.
Thank you!
You are still under warranty. Call Apple Care. Make sure you get a case number as all repairs have an additional 90 days of warranty.
#1 - You have 14 days from the date of purchase to return your computer with no questions asked.
#2 - You have 90 days of FREE phone tech support.
#3 - You have the standard one year Apple warranty.
#4 - If you've purchased an AppleCare Protection Plan, your warranty last for 3 years. You can obtain AppleCare anytime up to the first year of the purchase of your computer.
Take FULL advantage of your warranty. Posting on a message board should be done as a last resort and if you are out of warranty or Apple Care has expired.
Mac Pro

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Serial Number:          W01264M3HD3BA
Manufacturer:          SMP
Device Name:          bq20z451
Pack Lot Code:          0000
PCB Lot Code:          0000
Firmware Version:          0201
Hardware Revision:          000a
Cell Revision:          0158
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Fully Charged:          No
Charging:          No
Full Charge Capacity (mAh):          5923
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Amperage (mA):          -958
Voltage (mV):          11946
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Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          10
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Display Sleep Uses Dim:          Yes
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Disk Sleep Timer (Minutes):          10
Display Sleep Timer (Minutes):          2
Wake on AC Change:          No
Wake on Clamshell Open:          Yes
Current Power Source:          Yes
Display Sleep Uses Dim:          Yes
Reduce Brightness:          Yes
Hardware Configuration:
UPS Installed:          No
AC Charger Information:
Connected:          No
Charging:          No
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