Question PC random restarts even when idle. Power supply replacement? Or can be fixed?

[momozion18]

My PC just started having these random restart problems ever since I had used it in a house with voltage fluctuations in a power supply (big mistake not using AVR for it). Isn't affected by gaming, 'cause the restarts happen even when I just browse the internet or just idle. Even when I started using an AVR or went back to using the PC in a house where it worked perfectly before, I still get these restarts. However, I noticed that when I don't use the pc for a long time (like a week), I'd be able to run it for a long time, like 4 hours or, compared to when I regularly use it; where it could run for an hour at max, and after each restart it runs shorter each time. Could this be a power supply problem or something else? Or maybe some bios voltage settings could just help with this?

 

[--SID--]

Full system specs includes brand and model of the PSU?

 

[momozion18]

i7 6700
GTX 950
16 GB RAM
MB: Gigabyte H170M-D3H
PSU: Seasonic G-550

 

[AntonyLovric]

Is there anything in the windows events? System log?

Similar threads on Toms Hardware with the same motherboard:
Computer keeps restarting; New pc | Tom's Hardware Forum (tomshardware.com)
Question - Computer randomly shutting off, can't start up, no overheating. Happens very intermittently? | Tom's Hardware Forum (tomshardware.com)
Psu Failing ? | Tom's Hardware Forum (tomshardware.com)

 

[momozion18]

Is there anything in the windows events? System log?

Similar threads on Toms Hardware with the same motherboard:
Computer keeps restarting; New pc | Tom's Hardware Forum (tomshardware.com)
Question - Computer randomly shutting off, can't start up, no overheating. Happens very intermittently? | Tom's Hardware Forum (tomshardware.com)
Psu Failing ? | Tom's Hardware Forum (tomshardware.com)

System Log shows Event 41. Replaced my psu and it still happens

 

[--SID--]

Test without GTX 950 and the monitor connected to the motherboard.

 

[AntonyLovric]

System Log shows Event 41. Replaced my psu and it still happens

Did you get a chance to review the links I sent. Even ID 41 is pretty clear, windows wakes up and realizes it wasn't shut down properly. You should be ok with that PSU (it's not bad/rating is high enough). Any chance there is a lose connection? (ATX, SATA Power, Fan headers, etc.)

I like SID's idea about trying without the GPU. The other though it around heat / temperature. When it's cold it seems like it can run for longer without issue. (Wondering if a fan is running slow / failing?) You changed the PSU so that rules it out. What about the CPU/GPU/Case fans?

Antony