R8500 with latest V1.0.2.54_1.0.56 intermittently loses DNS

Hello Mikey94025

Welcome to the community!

Just to clarify, when you access the GUI of the router you don't see the DNS settings?

How about if you assign a static DNS on the router, will you be experiencing the same problem?

For now, the only troubleshooting you may do is to reset and reconfigure.

If the same thing happens, I suggest that you replace it.

Mikey94025,

I still have DNS errors a bunch of times every day and I still have the same Frontier to Nighthawk setup minus the bridged mode. I'll go out on a limb and say that none of your modem or router lights give any hint of connectivity changes durning these DNS hiccups, do they? My pair of paperweights flicker LED signals back and forth on the ethernet ports that connect them. Just like they do when I can actually get online. Nothing externally visual on either unit indicates trouble. 

Like I said, DNS errors happen every day, several times a day. And roughly during the same few hour windows each day. I use the outages like a clock. They happen at 3am, 5am, 11am, 3pm, 9pm every day. The first thing I do is close Chrome and immediately reopen it. The first two bookmarks are the modem then the router. I open two tabs and log into each unit in its own tab. Starting with the modem, I scan for any thing amiss. There never is. Sometimes I reboot the modem sometimes I dont. As the R8500 is second in the chain, I click on its tab and 9 times outta 10 the "Internet Status" is red. I've released/renewed addresses, rebooted it from the "router information" panel under "advanced", clicked on the "internet status" and clicked the "test" button, etc.

Doesnt matter all that much which DNS servers I have listed it seems. OpenDNS has the honors right now but I have used Google or the ISP defaults.

I should clarify that putting my Frontier in bridge mode was only a for a few days because I was desparate. I could no longer access the modem's web interface obviously and the DNS errors popped up like they always did, so I reset the modem. The Frontier gets the phone lines coming in and only feeds the R8500 via one ethernet cable, Wireless is disabled on the modem too. I cant duck the outages by flipping from wireless to hardwired on any tech we have. 

I ran pings to www.google.com with the /t switch enabled from anywhere I could. Timed out or got some crazy 2800ms pings. Updated R8500 thru 102 54 1056 firmware. Didn't matter. I pointed our tech around the router and modem to OpenDNS.and still have DNS errors just as often.

I was looking real hard at the Frontier modem as the culprit because of the rough schedule that the errors kept. Except all our connected electronics got IP and DNS from the R8500. The modem only ever passed one preferred address to the router and used OpneDNS too. 

Now I'm back to the R8500. Remember when I said, that from all outward appearances, the modem and router were blinking their LED's like everything's a go. Yet the R8500 is the only web interface where I saw the red "internet status" tile. In fact, the "advanced" tab had all green checked tiles every time. Short of the one red tile on the "basic" tab. And your "internet status" always reads GOOD. So what the hell?

The outage seems more of a duration event than one where we jiggle some wires with intermittent shorts, since neither of us has any luck with our varying approaches. Almost like a thermal enent occured which reset when the temp threshold is met. I don't know. I tried taking our iphones off wifi to ease congestion. I can't say it helped. Except for the iphone themselves. Not havng them on the home network, they will work while all others suffer.