1.1.1.1 timeout

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I am getting issues with using a custom DNS resolver on my Magio Optic internet.

Sometimes during the day for a short period of time ranging from a few seconds to a few minutes I cannot resolve any domain names via Cloudflare's 1.1.1.1 DNS as the DNS request times out. The issue also occurs when using OpenDNS and a VPN service's DNS servers, so the issue is not with 1.1.1.1's servers, but interestingly enough Google's 8.8.8.8 DNS works fine. I've tested on multiple devices and this is a network wide problem.

'nslookup telekom.sk' during an "outage":

C:\Users\acer>nslookup telekom.sk
DNS request timed out.
    timeout was 2 seconds.
Server:  UnKnown
Address:  1.1.1.1

DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
DNS request timed out.
    timeout was 2 seconds.
*** Request to UnKnown timed-out

Pinging 1.1.1.1 or OpenDNS works, as well as opening the 1.1.1.1 site in my web browser or any other IP address that has a website hosted on it.

Here is a traceroute to 1.1.1.1:

C:\Users\acer>tracert 1.1.1.1

Tracing route to 1.1.1.1 over a maximum of 30 hops

  1    <1 ms    <1 ms    <1 ms  192.168.1.1
  2     *        *        *     Request timed out.
  3     4 ms     4 ms     4 ms  213.81.252.23
  4     *        *        *     Request timed out.
  5    12 ms    14 ms    10 ms  62.115.155.166
  6    24 ms    24 ms    25 ms  62.115.119.186
  7    10 ms    10 ms    10 ms  62.115.136.219
  8    11 ms    11 ms    10 ms  80.239.194.86
  9    10 ms    10 ms    10 ms  1.1.1.1

The traceroute looks the same during an "outage" and when everything is working correctly.

This started happening sometime last year, before that I was using 1.1.1.1 and it worked well. I want to keep using 1.1.1.1.

Any help would be appreciated.

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