I preformed the next test suggested to me, by changing
/etc/X11/xorg.conf.d/50-device.conf to the following content:

Section "Device"
  Identifier "Default Device"
  Driver "amdgpu"
  Option "AccelMethod" "None"
EndSection

The frequency of the crash was reduced from a matter of seconds to 45 minutes,
but a freeze still occurred after that time.