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DNS constantly not responding, Internet drops multiple times a day

New Poster

DNS constantly not responding, Internet drops multiple times a day

This has been a persistent issue for the past 6 months. Some days I have great service but more often than not, whether it be on my Nintendo Switch, PC, iPad Pro, the signal will just drop and either stay disconnected or reconnect only to go out again a few seconds later, and it’s always the DNS not responding on all devices. Restarting the modem has become a bandaid over the problem as it still persists to disconnect constantly. I figured it was because my modem was old, so I went over to Xfinity to have it replaced, and now the brand new modem is constantly dropping. It’s especially frustrating since I stream on Twitch and it messes up my analytics. Does anyone have any advice or suggestions on what I should do? I explained all of this to the person at Xfinity yet he just handed me a new modem and offered nothing else.
Gold Problem Solver

Re: DNS constantly not responding, Internet drops multiple times a day

Devices often report a "DNS Error" when they are actually having trouble reaching the Internet at all. This is because when you click a link and as the page loads, the first thing the device needs to do is look up the IP address of the site, using DNS. Typically this needs to be repeated many times to load all of the page components. If any of these lookups fail because a of an Internet connection problem the device won't be able to access DNS and may incorrectly announce a "DNS Error" when "Connection Error" would be a more accurate message.


Are you connecting via Wifi or Ethernet? If Wifi, it's best to switch to an Ethernet cable connection if possible. That would allow you to determine whether the problem is with the Wifi signal, or with the link between your equipment and Comcast's network. Network connection problems that affect both Ethernet and Wifi devices are often due to poor coax connections, usually in or near your home.

If you want to troubleshoot this yourself, please see Internet Troubleshooting Tips. If you still need help, please post your modem or gateway's model number and signal information, especially downstream power levels and SNR, upstream power levels, and error log.

If you can't find the problem or you'd rather have Comcast take care of it, call them at the phone number on your bill or 1-800-Comcast, or use one of the options on If they can't fix the problem remotely (unlikely), insist they send a tech out to identify the cause and correct it.

If the tech finds bad coax, splitters, amplifiers, or connections in your home (even if Comcast originally supplied them) you'll probably have to pay for the visit unless you have their Service Protection Plan (, closed to customers that don't already have it). If the trouble is due to a faulty Comcast rental device, or anything outside your home, you shouldn't be charged.

New Poster

Re: DNS constantly not responding, Internet drops multiple times a day

Same problem here. Definitely DNS as streaming services do not drop, only things attempting a lookup.  Searching the forums, Comcast appears to have serious issues forwarding DNS on their network.

Cable modem shows good signal. Router performing nominally. Tech said my modem was EOL and needed to be replaced because it was only DOCSIS 3.0.  SMH...

Note: Was using, switching to to troubleshoot.