Pi-Hole Failing after ~24 hours

[SaltyQuetzals]

Expected Behaviour:

The Pi-Hole should be set up and not require intervention.

• OS: Raspbian Buster
• Hardware: Raspberry Pi 3B+
• Router: Netgear r6700v2 running Netgear Genie

Actual Behaviour:

After roughly a day, the entire network loses its internet connection. Cannot run pihole -r, because it requires internet. The Pi-Hole also loses internet connection, despite being plugged into the router via Ethernet. Resetting the router settings to factory defaults restores the internet, which means I do have internet when not using the Pi-Hole.

Debug Token:

I can't upload the debug logs to Tricorder (requires network access), so here's a Pastebin.

[jfb]

Try changing your upstream server from Cloudflared to something else. There is a SERVFAIL error in your log that may indicate a Cloudflared problem.

[SaltyQuetzals]

Changed the DNS to Google, no luck.

Here's the new Pastebin

[jfb]

You haven't changed the DNS to Google, you have added Google. Cloudflared is one of your upstream DNS servers.

[SaltyQuetzals]

In the admin console, the only DNS servers checked are for Google. Is there a setting somewhere else I'm missing?

I've restarted the Pi and run pihole -d again. Here's the new Pastebin. I don't see Cloudflare listed in the DNS variables, though I have configured DNS-over-HTTPS (using the manual method), which uses cloudflared.

[jfb]

Look at your Custom1 DNS server. Check box is checked.

[SaltyQuetzals]

Yes, I set it in accordance with the DNS-over-HTTPS docs.