Hi, few days ago I noticed that my T4U Plus drops 5GHz connection.

I reinstalled official drivers, forced in devices menager Wireless mode to IEEE 802.11a/n/ac then to IEEE 802.11ac.

As soon I start downloading something or open firefox, connection drops. In wireless mode auto connection is capped to 2.4Ghz 144Mbps.

I checked 5GHz with my phone (Iphone 15), 5Ghz 300Mbps (OK).

My router is Orange Funbox 3.0, Wifi 5&2.4Ghz combined.

I'm using this combo (Router & T4U Plus) for 2 years and was absolutely fine.

Windows connection specs on wireless mode auto:

Identyfikator SSID:    Orange_Swiatlowod_C8BA
Protokół:    Wi-Fi 4 (802.11n)
Typ zabezpieczeń:    WPA2-Personal
Producent:    Realtek Semiconductor Corp.
Opis:    TP-Link Wireless MU-MIMO USB Adapter
Wersja sterownika:    1030.52.731.2025
Pasmo sieciowe (kanał):    2,4 GHz (1)
Zagregowana szybkość łącza (odbieranie/przesyłanie):    144/144 (Mbps)

My question is if my Archer is dying or I did something wrong?