@linuxas Good day, Sorry for the delayed update, this looks quite weird and we wil have a specialist to follow up on your case via email with forum ID '170672' Please let us if the issue is resloved,...

@alelelelee Good day, Please disable the built-in or other wireless adapters on your computer if there is any. Here is a public driver for Archer T3U Plus, please give it a try：...

@CasacciaCesar Good day, You could try some suggestion here: Change a different Wi-Fi channel for router's 5Ghz, channel 36/40/44/48 is recommended Customize different SSID & wireless password for...

@rao4844 Thank you for your update, glad to help~

@MarkusD Good day, To answer your question, may I know do you use ( EU) version wireless adapter, and what is the hardware version of T3U? https://www.tp-link.com/en/support/faq/46/

@Achi1 Good day, Please disable the built-in or other wireless adapters on your computer if there is any. Here is a public driver for Archer T3U Plus, please give it a try：...