I noticed that as well. The only info I've found on the two different sensor readings is here, but unless I missed something it didn't suggest which to trust.
As for the CMOS fix. I spoke too soon. The problem is back. However, I realised that the debug code on a hard reset is D4, not 04, which means the mobo is saying 'PCI resource allocation error. Out of resources.' Going to research that now.
Edit:
In case you haven't tried this.... When googling the D4 error I found this thread at Tom's. Admittedly it's for a different Gigabyte board, but after reading it wouldn't surprise me if the Master suffers from the same problem as the Gaming 5. Anyway, one of the posters suggested turning off fast startup in Windows 10, which is enabled by default.
I'm now not getting the D4 debug code and my Vcore is where I expect it to be. At least for now, but this does seem to fit well with the whole only being buggy after a cold boot plotline.
Installed bios f7a and the cold boot problem seems to have gone
Also it seems the default auto setting for uncore is 43 now, it was 47.
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