@uziatake 

I have the EXACT same thing

@TP-Link 

Hi, I have the same problem on an Archer VR600v v2 (firmware version: 0.7.0 0.9.1 v0075.0 Build 200616 Rel.36749n).

In the router, the two DNS servers 185.95.218.42 and 185.95.218.43 are set in the WAN settings.

No DNS servers are set in the LAN settings.

The following messages appear in the system log at irregular intervals: 

The two DNS servers are monitored via two different monitoring systems and are permanently accessible.

This behavior was noticed because websites did not load at times. This short failure is due to the change of DNS servers.

Sorry to piggyback, I have the exact same issue with this, most of the time the system log shows: 

But then occasionally it decides to just take a dump on itself and instead shows

I've got a Pi-Hole server running as my local DNS, and the WAN DNS servers have been manually pointed to Cloudflare's 1.1.1.1 and 1.0.0.1

No matter what DNS settings I use it still somehow queries 8.8.8.8 and also somehow develops issues with connecting using 1.1.1.1 or 1.0.0.1

It's definitely due to this TP-Link Router as the original ISP router has none of the same issues apart from being just generally awful.

I did disable Bit swap in the Advanced>Network>DSL setttings, and for about 24 hours this solved the issue, but now it's back with avengence. If I can't get this sorted I'm going to have to get yet another modem/router. And for sure will never buy another TP-Link product.

@TP-Link Please help.

@TP-Link 

Hi, I have now found a halfway good solution to my problem.

I now use the DNS servers from Quad9. In contrast to my previous ones, these are interestingly accepted by the router without any problems.

Unfortunately, I have not yet been able to find a way to delete the Google DNS servers from the system.

However, it is possible to block the IP address via static routing. This means that a connection is no longer possible.

These two steps have solved the problems for me.