PC randomly reboots while playing games

[vaxoxen]

Over the past few days I've started to get an issue where my PC shuts down during playing a game, then reboots with the "Windows wasn't shut down properly" message. This has mostly been while playing Subnautica. If I let the system reboot afterwards and run the game again it happens again within 10 minutes. I thought it may have been an issue with the game itself but have since tested with Wolfenstein 2 and the same thing happens. Despite all this, twice in the past few days I have played 2hour+ sessions with no issues at all.

I've had no issues like this before a few days ago and no hardware changes in this time (the last hardware change was my GPU approx. a year ago). I have checked fans are working properly, have had a quick dust (it wasn't bad) and no unusual noises, etc while running.

I suspected the PSU is at fault and the reading similar topics online seems to suggest this too. Another discussion on here recommended doing an AIDA64 System Stability Test, which I have done (see below). A Prime95 stress test was also something many seemed to recommend. I chose "Blend" test and ran for around half an hour (log below). I will do a much longer test tomorrow and will update with the results.

My system:

• 
  ■ Windows 7 Ultimate 64-bit (6.1, Build 7601)
  ■ MSI Z87-G43 Intel Z87 DDR3 ATX Motherboard
  ■ Intel Core i5-4670K 3.40GHz
  ■ NVIDIA GeForce GTX 1060 6GB
  ■ Corsair 750W CX Builder Series 80PLUS Bronze PSU
  ■ Corsair 16GB (4x4GB) Vengeance DDR3 1600MHz
  ■ Hyper 212 Evo CPU Cooler

Besides the GTX 1060 (which is roughly a year old), all components date back to January 2014.

Does it look like it is the PSU that is at fault? And are there any other tests that would verify this? Thank you

Prime95 results.txt:

[Tue Jan 23 19:35:39 2018]
Self-test 400K passed!
Self-test 400K passed!
Self-test 400K passed!
Self-test 400K passed!
Self-test 8K passed!
Self-test 8K passed!
Self-test 8K passed!
[Tue Jan 23 19:41:07 2018]
Self-test 8K passed!
Self-test 480K passed!
Self-test 480K passed!
Self-test 480K passed!
[Tue Jan 23 19:47:07 2018]
Self-test 12K passed!
Self-test 12K passed!
Self-test 12K passed!
Self-test 560K passed!
Self-test 560K passed!
[Tue Jan 23 19:52:22 2018]
Self-test 560K passed!
Self-test 480K passed!
Self-test 16K passed!
Self-test 16K passed!
Self-test 16K passed!
Self-test 12K passed!
[Tue Jan 23 19:57:50 2018]
Self-test 640K passed!
Self-test 640K passed!
Self-test 640K passed!
Self-test 560K passed!
Self-test 20K passed!
Self-test 20K passed!
[Tue Jan 23 20:04:38 2018]
Self-test 20K passed!
Self-test 720K passed!
Self-test 720K passed!
Self-test 16K passed!
Self-test 720K passed!
Self-test 24K passed!
[Tue Jan 23 20:10:56 2018]
Self-test 24K passed!

 

[vaxoxen]

To those that may have a similar issue, I got a new PSU and the problem stopped.

 

[toshibitsu]

Normally when something like that happens(and it's hardware related), it's either from overheating or a PSU that's malfunctioning. Glad you got it working properly again.