Computer losing power randomly

[Aceclaw]

I'm not sure where to put this post, but I'm in need of help. My computer keeps losing power, I thought it was my PSU so I replaced it. Everything was fine for about two days. Then it shut down again and now doesn't stay powered up for long. I've tried a memory test and no issues. Also my PC temps are usually cool so I've ruled those two out. My motherboard was replaced a few months ago. It now just loses power at random intervals. I'm not sure what it is. All my fans power on normally and I can boot up just fine, but the power just drops. Kind of starting to panic at this point, don't know a ton off just my first build.

AMD 8350 Eight core processor 4ghz
16gb Ram
Windows 10 OS
AMD R9 200
GIGABYTE GA-970A-D3P AM3+/AM3 AMD 970 SATA 6Gb/s USB 3.0 ATX AMD Motherboard
EVGA 850W BQ Power Supply

 

[Lutfij]

Which R9 200 series GPU do you have exactly? Why did you have your motherboard replaced, did it suffer from some form of power surge or did the motherboard give out? I'm kind of leaning towards the PSU or the wiring in your residence to be the culprit or that the motherboard simply can't handle the 125W processor. Speaking of processor, are you on an overclock?