21:53, Nov 06 CEST
The Upstream DNS Servers both piholes use (DNS.watch) are currently under attack. This results into either timeouts or very slow page loads. I've temporarily changed the upstream DNS servers to Google's to mitigate this issue. Sadly DNS.watch has no status page nor contact page, so I am unsure if they're aware of these issues. I will continue to monitor the situation.
21:12, Nov 10 CEST
It looks like the DNS.watch services have been restored. Therefore both Pi-holes are now using DNS.watch's upstream servers again.
Back to current status