Wired speed of WDR4300 is normal, right? Did you check the link speed of wireless connection? Are you connecting to 2.4GHz Wi-Fi only? Try channel width 40MHz and ensure the network is secured with...

Upgrade the latest firmware first. Signal strength is strong on your wireless clients? Try different channels like 1, 6 or 11.

eloriseph wrote I have the same problem. (archer c7 v2, newest firmware here, ipv4 & ipv6 dual stack from the provider) ISP speed is 400 mbit/s. After restarting the router i get the full speed over...

What's the operating system of your PC? The driver has been installed and you can detect your Wi-Fi network, right? It keeps connecting and then resetting itself over and over. What does it mean?

You get no connection at all or the connection is just slow but connection still works sometimes? What's the ADSL type? Check the line rate when it doesn't work normally.

Install powerline utility and check the rate between PA4010 and WPA4220. The speed varies in real network environment. And file transfer speed is limited by devices themselves as well. Do you know...