Cama reboots ubuntu. where to dig?

Question

ubuntu

ubuntu reboots itself,
it may go into a cyclic reboot, or maybe not.
Reinstalling the system did not help, during the reinstallation process there was also a reboot several times (I installed it from the third time).
PC 4 months of them 2 as it started to reboot.
reboot does not lend itself to any logic. (it may not reboot for two days, or maybe 5 times a day with the same work) I
will provide what information and logs you need



Distributor ID: Ubuntu
Description: Ubuntu 19.10 kernel 5.3.0-51-generic

PROCESSOR
model name : Intel(R) Core(TM) i3-8100 CPU @ 3.60GHz

hard
Model Family: WD Blue and Green SSDs
Device Model: WDC WDS240G2G0A-00JH30
Serial Number: 19402D805819

Base Board Information
Manufacturer: ASUSTeK COMPUTER INC.
Product Name: PRIME H310M-R R2.0

memory
Description: System Memory
Physical ID: 38
Slot: Motherboard or Motherboard
Size: 8GiB

Power Supply AEROCOOL VX PLUS 500W, 500W,

Answer 1

There may be an overheating or problem with the power supply. Or something with drivers or BIOS/UEFI settings.
View /var/log/messages, /var/log/kern.login moments before reboot.
What is output by the command last reboot?
Try changing the default reboot settings to false:

Answer 2

Even with hardware or BIOS