Hi all,

If you have the disconnection issue with your router, please provide the information mentioned below so that we can speed up the whole process and offer a solution. 

1. Please give us a brief introduction to the current issue; what kind of troubleshooting you have done and what about the corresponding results. 

2. What is the model number of your device? And its hardware and firmware version. 

Note: Please ensure that its firmware is already up-to-date. 

3. Please check the country version of your router as well. It is printed on the bottom label of the actual device, next to the model number.

4. You can try to create the network profile manually or update the ISP profile. 

https://www.tp-link.com/support/faq/1663/ 

5. Please keep an eye on the Band info (Advanced-Status page) when the network is working fine and when it is not, whether there is a difference.

Thanks for your support and cooperation in advance. Have a nice day. 

@Virgixx 

Hi, you can find the beta firmware to select the band manually on the MR6400 here:

https://community.tp-link.com/en/home/forum/topic/241534

Note: Be sure you are installing the correct firmware for your hardware, you can verify that by checking the router bottom label, which will display a V4 or V5.