My Pi 3B+ (full config details at link) has started to lock up out of the blue (red and green LEDs on), requiring a reboot. Which system log(s) do I check to see what the problem might be?
Which system log(s) do I check to see what the problem might be?
It is difficult to answer the question without knowing what operating system you are using. But most modern distributions use systemd, also Raspbian since version Jessie. So you may find the journal. Just have a look at it with:
rpi ~$ journalctl --pager-end
Or more detailed
rpi ~$ journalctl --pager-end --catalog