Win10 restarts after overnight, then works fine

[Abnormalia]

So last 2 weeks noted this weird behavior. 

 

Windows 10 2004. All updates, BIOS, Drivers etc. Power plan - AMD Balanced

BIOS settings: 3900X, DOHC 3600, vCore undervolted -0.1v, rest settings are mostly default, PBO auto. 

 

So It works fine 2-3 days no crashes etc. If I shutdown and turn on in the morning, as soon as windows logged in it restarts suddenly (no BSOD) in 2-3 sec, and after that works fine.

If I restart it after that np. Eventviewer shows nothing except unexpected shutdown.

Temps are fine, 47-50 idle and 75-77C on max synthetic test and load boosting all cores 4200-4300.

[homeap5]

Big undervolting. If you want to do it better, use offset adaptive mode and set -0.05v.