Computer randomly shutdowns or freezes

MSI Radeon R9 280X Gaming Edition OC 3072MB GDDR5 PCI-Express Graphics Card
Kingston HyperX Savage Red 8GB (2x4GB) DDR3 PC3-19200C11 2400MHz Dual Channel Kit
Antec TruePower Classic 550w '80 Plus Gold' Power Supply
Seagate Barracuda 1TB 7200RPM SATA 6Gb/s 64MB Cache
Cooler Master K380 Midi Tower Black Windowed Case
Asus M5A97 EVO R2.0 Motherboard
AMD FX 8350 8 core 4ghz processor

This happens randomly, once while installing origin it froze
It also randomly shutdown while playing BF3 multiplayer.
I never know when it will occur.
I thought it may be the socket that my powersuply is connected so I swtiched sockets. SO far so good. But I havent tested a video game out yet to know for sure. Please help me
 

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Is it always random or are you doing specific things like gaming when this occurs?
 
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