I have 10 PCs in network. All PCs are with Windows 10. Archer C2300 randomly disconnecting wired clients from internet. When I run the network problem diagnostic in Windows, the result is "the DNS server is not responding". On other PCs in network, internet is working.

Network is still working, I can still ping other devices or access to the router configuration.

I have DHCP activated I also tried enter IP address and DNS manually....  When I turn off the ethernet connection and connect via WiFi, internet connection is working.

When I restart the router, everything is working. These problems were started, when I was replace my old router with this one.

Do you have any solution?

Thanks