@taus4u You can try the beta firmware we provided here, which is marked as the Recommended Solution, then disable the Onemesh on the router: https://community.tp-link.com/en/home/forum/topic/207232

@Elliott_E Thank you for reminding. The specification you pointed out needs to be updated, the hardware v1 has 4 10/100Mbps LAN Ports & 1 10/100Mbps WAN Port.

@wirszews Thank you very much for the clarification. Please monitor if the issue still persists after updating to the latest version. BTW, as for the DFS channel, please be aware that when the router...

@Despotas If that is the case, I think the issue you are encountering is different from the OP. Can you please confirm the issue again with more details? Do you power off the router often, and the...

@SnehBansal Try to clone the WR720N's WAN MAC address to the C20, then reboot the modem and the C20, check again if the speed is normal. How to do MAC clone: https://www.tp-link.com/support/faq/2264/

@Yafi Please check if the internet parameters on the C6 and on the previous/old router are the same, such as WAN IP address, gateway, and DNS servers. You can try to change the DNS servers on the C6...