Think my PSU is causing my computer to shut off

[DL1219]

Good evening gents,

My power supply is about 5 years old and recently when running newer games my PC has been completely cutting the power. Initially I thought my CPU was overheating but after checking out CPUID i see its running in the 40Cs while playing fallout 4. Same goes for my gpu. I was wondering whats the best way to determine if my PSU needs replacing

Specs:
Mobo:Gigabyte GA-970A-DS39
CPU: AMD Fx-8320 3.5ghz
GPU: GeForce GTX 960
PSU: Xion 700W
I appreciate any help and advice, apparently that power supply is known to be a low quality but its lasted for years with no issues.

 

[Dark Lord of Tech]

Xion 700W , more than likely yes as they are very very poor power supplies.