Can you help me diagnose PC freezing problem?

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6 Dec 2004
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Calling the Overclockers Hive-Mind

I have a relatively old PC build (2016)

Gigabyte GA-Z170X-Gaming 5​
Intel Core i7-6700K​
32Gb Crucial Vengeance LPX​
MSI GeForce GTX 1070 AERO 8G OC​
Samsung Evo 970 Plus 1 TB NVMe M.2​
Windows 10​

For the last couple of months, my PC has frozen within minutes of starting up (reboot or from sleep). It boots into Windows and at random, within a few minutes (sometimes almost immediately) the pointer stutters, slows to a crawl and then the whole system locks up. Sometimes when it reboots, the BIOS has forgotten what HDD to boot from and I have to reset it. Sometimes (rarely) I get a network problem and it fails to connect to my router (ethernet cabled). Usually after a reboot, everything is fine. I'm getting the impression it's a hardware problem and there's a component that needs to warm up first before the system become stable.

I've checked Windows integrity and repaired.
Windows is up to date, as are all drivers.
I've checked for any odd startup programs and services but nothing seems to be suspicious there.
Device manager shows no issues.
I've run a memory test, and that seem to be fine.
The onboard diagnostic LED doesn't give any error codes.
The system runs fine under load (games).
Dust has been vacuumed out of all fans, etc.
No wires are loose on the mobo.

I'm at a loss as to what is going on but suspect it might be something like the power rails or something really low level.

Does anyone know of a hardware monitor that could be run and capture what is going on at freezing, or have any other thought?

Thanks in advance.
 
Thanks for your replies. I forgot to say that I looked at the BIOS battery as the very first thing and indeed it was quite flat. I was hoping that replacing it would solve the problem, but alas no. I also cleared the CMOS but that didn't fix anything. I've was sequentially removing USB devices since one of the BSODs showed a code that suggest it was that, but as yet to no avail.

Thankfully I've just built a shy new PC so I can decommission this old one. I was hoping to pass it on to my daughter so will preserver with troubleshooting, but I agree that it's likely to be the mobo and probably undiagnosable and/or fixable. I may invest in a new mobo because the CPU, RAM and card have all been very dependable and surprisingly capable.
 
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