unsafe shutdown

Hi, I've got a Samsung NVMe 970 Evo on a Gigabyte Aorus Pro z390 board. It' seems that all that motherboards (Z390 chipset), no matter witch brand (Asus, Gigabyte, Asrock), after a power loss do a boot control, switching on the PC for 3 / 5 seconds. After that the system shut down and then...