PC turns itself off when I'm playing

Hello people who possibly will solve my headache
I played was RUST, I was playing 2-3 hours to shut down, the problem persisted until the present day, with all the games less LOL (League of Legends) Note: does not turn off until you play.


Other games I tested was: Sim City (2013), The Sims 4, The Sims 3, Rust, total war Shogun 2, BF4,BF3,NBA, FIFA 15, FIFA 14,CS-GO
turned off between 5-10 min, less LOL, and the fifa it took 30 minutes, no matter if I just turn on the PC and start the game, it goes off.

Yes, I tested everything (I think), I rubber in memory, did MemTest, I monitored temperatures, changed the slot of RAM, I cleaned everything, even formatted .. .

Anyway my Specs
GTX 760 (updated drivers)
AMD FX6300 processor (up to 67C)
Motherboard
ASRock> 980DE3 / U3S3 (updated bios and drivers tb)
8GB 1600MHz Kingston HyperX single (sink somewhat hot, I saw this in dedometro)
Source Cougar SL600W
HD 1TB WS
Refrigerated Gabinite (XTRIKE) (already tried playing without the lid)



EVENT LOG (when disconnected from it)


Source: Microsoft-Windows-Kernel-Power
Date: 03/28/2015 17:25:55
Event ID: 41
Task Category: (63)
Level: Critical Level
Keywords: (2)
User: SYSTEM
Computer: user-PC
Description:
The system restarted without a shutdown without error first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly.




TEMPERATURE IN GAMES:


Processor: 65C max)
Video card: 60-50C
Mother: 40-50C



Did the furmark test too,turned off in 7 min
MAX





AIDA: +12 V 12.091 V/ when was stressed GPU : CPU +12 V 11.774 V

Hugs..PLS HELP