Is this all there is when things go south? (EDIT: with verbosity set to 3?)
If so, increase verbosity to get more details?
pi@ph5b:~ $ man unbound.conf
[..]
verbosity: <number>
The verbosity number, level 0 means no verbosity, only er‐
rors. Level 1 gives operational information. Level 2 gives
detailed operational information. Level 3 gives query level
information, output per query. Level 4 gives algorithm
level information. Level 5 logs client identification for
cache misses. Default is level 1. The verbosity can also
be increased from the commandline, see unbound(8).
pi@ph5b:~ $ sudo nano /etc/unbound/unbound.conf.d/pi-hole.conf
[..]
verbosity: 0
Run below to apply:
sudo systemctl reload unbound.service
Can run below to follow the unbound journals live:
journalctl --full -f -u unbound.service
Dont forget to set back verbosity to zero when done bc this takes up disk space if run for too long!