Ubuntu笔记本家用服务器随机自动关机问题排查与解决求助

大家好，我把一台笔记本当成家用服务器用了大概2个月，上面跑着Docker和6个容器，平时主要通过SSH或者Portainer来管理。大概一周前开始，它会毫无征兆地随机自动关机，有没有大佬能教教我怎么排查原因，以及怎么解决这个问题呀？

我已经运行了last -x | head | tac命令，输出结果如下：

runlevel (to lvl 5) 6.5.0-28-generic Fri May 3 23:03 - 23:11 (00:08)
moksh pts/0 192.168.1.30 Fri May 3 23:04 - 23:07 (00:03)
moksh pts/0 192.168.1.30 Fri May 3 23:07 - 23:11 (00:03)
moksh pts/0 192.168.1.30 Fri May 3 23:11 - 23:11 (00:00)
shutdown system down 6.5.0-28-generic Fri May 3 23:11 - 23:12 (00:00)
reboot system boot 6.5.0-28-generic Fri May 3 23:12 still running
runlevel (to lvl 5) 6.5.0-28-generic Fri May 3 23:12 - 14:14 (3+15:02)
reboot system boot 6.5.0-28-generic Tue May 7 14:14 still running
runlevel (to lvl 5) 6.5.0-28-generic Tue May 7 14:...

备注：内容来源于stack exchange，提问作者Moksh Chitkara