Windows OS have everything to do with loss of hashrates when updates get into your system without you knowing until you restart your PC, when I couldn't find a effective way to deactivate windows 10 update I've reload the whole OS just to get my normal hashrate back
I just did Win 10 updates on all my machines...no issues. I set the scheduler so it doesn't automatically apply updates (i.e. restart) until I do it manually. Still rock solid:
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lolminer5700XT 51.9 66.7 60 0 0 5 minutes ago
rig3070 61.3 67.8 61 0 0 6 minutes ago
If this is a new build you will still face the wrath of windows 10 soon, I never knew this could be possible because before the lost in hashrate I used the PC for weeks with no issue but later my hashrates starts showing low hash speed