Pi-Hole locks up, no longer reachable

[deHakkelaar]

Whenever you've got unexpected outages on a Raspi, check for under-voltage/brownouts first:

500 Internal Server Error

Does below one show any Under-voltage messages? sudo journalctl --full --no-hostname --pager-end --grep voltage If so, have a look below: If you see warnings, switch to a higher quality power supply and cable. Low quality power supplies can corrupt storage or cause unpredictable behaviour within the Raspberry Pi. https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#power-supply-warnings