XMP - system post in safe mode. Happened once after some time pc off

[sew999]

Hi. My mobo is Asus Z370 Pro Gaming.

And rams: Gskill 2x8GB 2133mhz ( XMP 3000mhz ).

https://www.x-kom.pl/p/312567-pamiec...l15-2x8gb.html

Cpu 8700K.

When i choosed in UEFI first time XMP profile i saved and booted fine to UEFI.
I turn off pc,turn on again after 3 hours, and then, i met screen:
THE SYSTEM HAS POSTED IN SAFE MODE.
This happened just once. Now its booting fine,but i dont know why it booted just once with this message.

This is screen from internet ( not my pc ) ,but the same msg to show:



I tried to reproduce this warning but i am not able to do that. Reverting to standard and then again to XMP save. Turn off pc by power button. But not warning. Any ideas why it happened just once,and still its something wrong?

This occured when pc was off some time , 4 hours . And then. I met users using XMP with the same issue , only after pc was off some time like overnight.
So it not never happen when i turn off pc and immidiately turn on. Only just when pc is off few hours.

Memtest not showing errors also.

Really appreciate it for help. This is my new pc.
Memory currently are on 3000mhz xmp speed, and stable,no crashing in 3dmark.

[David (PassMark)]

The general policy with PCs is, if it ain't broke, don't fix it.

PCs are an extremely complex combination of hardware and software and do one off strange things all the time. Generally it does't make sense to worry about things have fixed themselves with a reboot and aren't reproducible.