Computer Randomly Restarts When Gaming

My computer randomly has been freezing when gaming and will usually stay frozen until I restart it. Most of the time the computer will completely restart. I did a test about 30 minutes ago, I turned on high graphics while playing a game and it froze without ever restarting/shutting down. It has been doing this ever since I received it.

PC Specs:

Operating System
Windows 8.1 64-bit
CPU
AMD A10-6700 57 °C
Richland 32nm Technology
RAM
14.0GB Dual-Channel DDR3 @ 678MHz (9-9-10-24)
Motherboard
ASUSTeK COMPUTER INC. M11BB (FM2 ) 36 °C
Graphics
HP 20wm (1600x900@60Hz)
2047MB NVIDIA GeForce GTX 660 (EVGA) 32 °C
Storage
223GB SSD2SC240G1SA754D117-820 (SSD) 35 °C
Optical Drives
ASUS DVD RAM GH95N
Audio
High Definition Audio Device