@PierreCN  Hi, 

With T3U plugged in, please check if adapter hardware is detected by your PC or not : Windows icon -> search" Device manager" -> Network adapter/Other device.

It could be shown  as "Tp-link Wireless XX "  or " 802.11n/ac" or its chipset model like RTLXX. 

Plug the adapter to another USB port on your PC.

As a comparison, plug T3U into a different PC and see hardware is detected in device manager or not as well. 

If hardware is detected, please double-click on tp-link adapter and check Device Status and send us a photo, and check share us a photo of the  driver date and motherboard info as this FAQ: How to check driver version of TP-Link adapters and system information of your computer?
https://www.tp-link.com/support/faq/2722/

@PierreCN Great, thank you for your update!

@PierreCN Hi,

Thank you for your update,  after the Windows disconnection sound, please check can you find adapter  under

Device manager-> Network adapter/ Other? Double click on tp-link adapter and check the Device Status, is there any Error? 

If possible, you could try this adapter on a different computer, and see if it could be always recognized . 

May I have a photo of the computer motherboard information & driver date of your computer, thank you!

https://www.tp-link.com/support/faq/2722/