@Wheelsy-James If you have another PC with different motherboard available, then it might be worthwhile to test it in that PC as well. That should tell you whether the TX20E is actually broken or if...

@Wheelsy-James The Wi-Fi part works via the PCIE bus, while the Bluetooth part works via the internal USB connection using the small cable. Both are separate devices in Windows. So, in the Windows...

@Nertip Hi, At the times when the Wi-Fi speed is slow, is it slow on all three bands (2.4 GHz, 5 GHz, 6 GHz) or just one particular band?

@Maciej Hi, Any chance that you may have previously restricted the access to the web GUI and later forgot about it? This has happened to other users before.

@Ranjana14 Hi, Most extenders have a small button labelled "Reset". Press that "Reset" button for a couple of seconds or until all LEDs switch on for a moment. After that you can setup the extender...

@Wheelsy-James Hi, In case your motherboard also has an PCIE 1X slot, do you see a way of shuffling some cards around to free it up for the Archer TX20E? I can't say anything about the Archer TX20E...