Fresh Install Issues - AGH Causing Issues After Some Time

[jpowell697]

Have a brand new Raspberry Pi 4b, 4GB RAM and new ImagePro 256GB SD Card.
Pi has DHCP reservation set on router. Pi has cooling tower and power from outlet.

I got the OS installed using the Pi imager and then installing the AGH using the CURL method last night. Did the initial config and left things pretty vanilla. Saw it working fine last night with phones and PCs. This morning I see the TVs having issues. Added exemptions in Custom filtering rules, still didn't work. Ultimately, I unchecked the filters, Disabled protection, and set the DNS servers to three that I have on my Linksys MR9600 router: 1.1.1.1, 8.8.8.8 and 75.75.75.75. At this point, AGH should be working just as my router does. Also, to rule out any thing else network, I connected the Pi directly into the router.

Throughout the day today, I'd have intermittent network outages (very uncommon for my network/internet). Red light on Linksys would come on indicating no internet connection, yet I was still able to reach sites on the internet. Come this evening, I'm working fine on my PC, but my son cannot connect to college canvas site. Switched him over to wired connection too. Still had issues and sites were painfully slow to come up, if at all. Also set on AGH DNS server to Comcast alone which has worked absolutely fine in the past, but still having issues.

Switch off the PI so the router is used for DNS and things start loading instantly as they normally would. So I am still at square one: running only DNS via the AGH application is breaking things.

I also see terrible Upstream response times for last 24 hours: 1.1.1.1:53 14233ms, 8.8.8.8:53 513ms, 75.75.75:53 505ms, https://dns10.quad9.net:443/dnsquery 505ms,

Some other Upstream times were not so bad: 208.67.222.222:53 48ms, https://dns.cloudflare.com:443/dns-query 44ms, https://doh.opendns.com:443/dns-query 41ms

Fairly certain I'm not facing a hardware issue. Broke AGH down to do simple DNS request by IP. Not sure what's going wrong here!