Computer restarts or shut down automatically

[Jason123665]

It's hot summer in my place. Recently my computer has an issue. When I am using my computer, sometimes my monitor goes black screen suddenly. Then my computer restarts or shut down automatically(Totally no warning nor blue screen). I monitor the temperture of cpu and gpu and I found that they are fine. Cpu temperture won't pass 75 °C when I'm playing games. All hardware are working fine. This problem occurs around twice a day. Help pls

My spec:
Ryzen 5 1600
MSI GTX 1060 6GB
MSI B350M GAMING PRO
G.Skill Aegis Gaming 3000mHZ 8GBx2
Antec 450W 80Bronze PSU

[NelizMastr]

Maybe your PSU is actually overheating. Is it top or bottom mounted? Also which model is it? VP450P?

[Jason123665]

9 minutes ago, NelizMastr said:

Maybe your PSU is actually overheating. Is it top or bottom mounted? Also which model is it? VP450P?

It is top mounted. The model is Neo Eco II

[KeitaRR]

Go into event viewer and see what error messages you got

[Jason123665]

19 hours ago, KeitaRR said:

Go into event viewer and see what error messages you got

It only shows a accident shut down with no reason.

[KeitaRR]

Looking back to your previous posts you seem to have the same issue back in august 2017 when you first built your computer, was it fixed since then and it happens again now because your original post says it started happening recently? If it was working fine between these periods what was the original problem? If not what other troubleshooting steps have you taken besides looking at the temp? reapply thermal paste? swap parts? try different ram slots?

[Jason123665]

15 hours ago, KeitaRR said:

Looking back to your previous posts you seem to have the same issue back in august 2017 when you first built your computer, was it fixed since then and it happens again now because your original post says it started happening recently? If it was working fine between these periods what was the original problem? If not what other troubleshooting steps have you taken besides looking at the temp? reapply thermal paste? swap parts? try different ram slots?

The previous problem is my computer had a booting problem. I solved it by setting a lower RAM frequency. Now I am having a problem while using my computer.Other than checking CPU temperature, I tried registry cleaning and putting a fan near my computer. Both methods show no help to the problem. I tried to set a lower CPU voltage and the problem didn't happen for a single day. I will try for few more days and see if the problem has been solved. Thank you btw.