@Archer-C6U_ Hi, They have some of the models that support Speed Limit via router firmware upgrade, check this thread they posted. You may move your thread to the "Feature Request (Routers)" forum...

@DarkSeb Hi, Does these IPv6 setting parameters provided and required by your internet provider? What if you try Dynamic, will the router receive an IPv6 connection automatically? If you cannot enter...

@Bid Hi, Any special settings on the AX3000 wireless settings, such as AP Isolation? Try disabling it if it's enabled. You may also check if you can find "Short GI" under the Advanced wireless...

@SHUBOJIT Hi, Will the internet LED on the C6 turn orange or red when the internet drops? If yes, go through the troubleshooting suggestions provided by TP-Link in the following link: Router...

@shawonarif Hi, If there is no mention of "this version cannot be downgraded", then you could downgrade the firmware to the previous version. So just download the previous version from the local...

@rafaelfuent Hi, 80 mtrs is too long for the Ethernet cable since it has already reduced the transmit speed. Even cat 6 and cat 6 cables would make a difference when it comes to the cable quality....