What is overheating or is it my psu failing?

bob2244

Honorable
Dec 7, 2013
1
0
10,510
Intel i52500k @ 3.3 GHz
8Gb Ram Corsair Vengeance
Windows 7
Nvidia gtx 670 Evga
ASUS PRO Z77 V
120 gb ssd boot drive
2tb hdd
Up until a few days ago my computer has preformed admirably but not when it is under heavy loads like gaming or running a performance analysis it loses power and reboots. My first thought was that something was getting too ho,t but temperature monitors showed that my cpu's max temperature was 35 degrees Celsius and my gpu's max was at 36 degrees. Is it possible that my power supply unit is failing? Before this it was fine but I'm not sure what else it could be.
Thanks for reading.