How to Debug Issues on Netgear R7800

Ok, long story short. My problems have continued and I am not certain of the source. I thought it may be Openwrt so I switched back to the stock firmware. However, I continued to have issues connecting to the internet and so, I went back to Openwrt.

Last night my internet went down and, while I am unsure of the cause, Here are the symptoms I observed:

  1. Connection from wired and wireless devices to the router seemed stable and unaffected
  2. No client could access the internet (wired or wireless)
  3. I am not sure if the router could access the internet
  4. The modem LEDs indicated that internet status was up and OK
  5. Rebooting the router did not fix the issue
  6. Rebooting the modem fixed the issue

Here are a few more details about my setup.
Router: Netgear R7800
Firmware Version: OpenWrt 19.07-SNAPSHOT r11343-1b5a45a4a7 / LuCI openwrt-19.07 branch git-21.107.58152-c19c716
Kernel Version: 4.14.231
Hynman build: Build for Netgear R7800

I can post Kernel and other logs but I don't quite know what to look for...

Does anyone have any advice?