@chim57 Thanks for your effort to do the troubleshooting on the TL-MR6400. While cause the issue still presistent, you can try to install the beta firmware to give it a go and test whether it works...

@MikeYYY Thanks fo ryour reply, glad to hear that it works well now. You can take more time to test its performance. Any further problem, do not hesitate to contact us. Good day.

@titiinorbita The Deco series can build up a mesh wifi system, click instruction below to get more information. https://www.tp-link.com/support/faq/2248/ May it help and have a nice day.

@Mikkelmaan What is the current network diagram? In general, if the WAN DNS or WAN IP is in the same network segment as the LAN IP, it will cause the IP conflict. So it is recommended to change the...

@Alexei Thanks a lot for your information. To do further analysis and help you to fix it, our engineer will email later. Please wait patiently until they contact you. Thanks for your support and...

@s_rosenthaler If I enter tp-link.de, it will redirect to the local Germany official website and error 404 for tp-link.ch; Good day.