Fios randomly loses internet connection

[jproper1]

I have had Verizon Fios service with the CR1000a router and G-211M-C ONT for a little over 2 years with no problems. Starting about a week ago I have been having problems with the internet randomly dropping connection. This is extremely problematic for me as I work from home. The connection will come back eventually on its own but it can take a while. When the internet drops the ONT shows completely normal green lights. And the CR1000a is showing a steady white light. But, the internet is not reachable on work computer/phone/TV/other devices. Thinking it might be an issue with the router I swapped it out with the TP Link AX4400 Wi-Fi 6 Router that I had from before. However, same issue pops up and internet cuts out. The issue did vanish for a couple of days but has recently came back and seems even worse than before.

I think that when the internet drops it does not actually cut out already established connections (if I am on a Teams call it will continue to work and the google home/Alexa will still answer indicating that they have internet). Maybe something is going wonky with the DNS? I have it set to Quad9, but also switched to google and same issue. Looking at the advanced logs in the router this is the only errors that pop up when the issue happens:

• [CLOUD.3][ADV] curl_easy_perform() failed:(6) Error.
• [CLOUD.4][ADV] cloud test link failed, try again

If I log into the MyVerizon app and run the troubleshooting thing it seems to reset whatever the issue is and it will work for a bit until it happens again. At this point I am almost certain that the issue is something up the line from me. Does anyone have any suggestions or seen this before?

[jproper1 · Accepted solution]

I just wanted to give an update in case anyone is having a similar issue. I spent a bunch of time on this yesterday and ended up changing the DNS from Quad9 to Cloudfare and the issues completely resolved.  Quad9 does not say they are having any issues so I am not sure where/what the underlying issue is but changing the DNS resolved the problem.

[jproper1 · Accepted solution]

I just wanted to give an update in case anyone is having a similar issue. I spent a bunch of time on this yesterday and ended up changing the DNS from Quad9 to Cloudfare and the issues completely resolved.  Quad9 does not say they are having any issues so I am not sure where/what the underlying issue is but changing the DNS resolved the problem.

[Capricorn1 · Accepted solution]

I've had good luck pointing to Google's public DNS servers in addition to Cloudflare. My list (excluding internal IPs) looks like this:

2001:4860:4860::8888
2001:4860:4860::8844
8.8.8.8
8.8.4.4
1.1.1.1

I don't have Cloudflare's other IPv4 DNS server IP or IPv6 DNS servers in my list, but those should be:

1.0.0.1,
2606:4700:4700::1111, and 
2606:4700:4700::1001

[Cang_Household]

Curl 6 error is hostname non-resolution, so DNS indeed. Buy why? Is your regional DNS servers too busy or some other customers around you is DDoS'ing the DNS servers.