@Nokuroku AX1800 doesn't support configuring Range Extender mode nor WDS if that's what you're after: In your case the Access Point mode can be used for that, but it involves using an ethernet cable...

@Stenness Try these wireless settings to see if any improvement: Reboot AX50 after saving the settings.

@AzSGenie I think with mesh technology, I should be able to seamlessly transfer between AX1000 and RE605X. Yes, that's correct - see the OneMesh description. Shall I able to connect to RE605X in mesh...

@VC7 Make sure you have QoS disabled, then test again. If this persists change the LAN cable between the modem and C7 (Cat 5E/6) and test again. If this still doesn't help hard reset (method 1) the...

@theuns Use this guide to configure a USB connected drive. You can use your device user guide - Chapter 5 for details as well: https://static.tp-link.com/2018/201804/20180428/Archer%20C5(SP)_UG_V4.pdf

In the following diagram is the typical network topology: Before you start, I would suggest to backup the TD-W9960 and C80 configuration just in case something goes wrong. You will need these...