@NoName_2002 

Hi,

Can you test if the 5 GHz stays connected after you separate the 2.4 GHz band and the 5 GHz band into two different SSIDs on the Orange Funbox 3.0 ?
 

  @woozle Yes, I've already tried that. For some time 5Ghz is active then it disconnects and switch to 2.4GHz. WiFi status bar shows weak signal 2/5 but for 2 years as I mentioned was everythink fine, strong signal (my router is directly below Archer). Every other device shows full signal exepts Archer. I've bought Archer TX55E, so I will tell you if new Archer is working correctly or it was something router problem related.

Unfortunately my archer died. Even on 2.4GHz it will turn off itself every 10 seconds.

New Archer works fine (320 Mbps) but I have problem event with it. TX55E comes with built in Bluetooth (via Motherboard internal USB) but Windows 11 in device manager reports Code 43 "A request for the USB device descriptor failed". I've tried diffrent connector (JUSB1, JUSB2), reconnecting cable to Archer, but problem remains. I've tried to install drivers for BT but of course installer returns no bluetooth card found.

  @NoName_2002 

So, now you have two USB devices that won't work on your computer?

I am starting to wonder whether there might be a problem with the USB controller of your computer?

Can you please plug the Archer T4U in a different computer to verify it is really dead? 

  @woozle So, old Archer is definetly dead. Other devices like my laptop or girlfriend PC doesn't recognites it. 

On new Archer Wi-Fi works perfectly fine (PCIe) but Bluetooth still returns Code 43 "A request for the USB device descriptor failed". I've tried to change motherboard internal USB connector (JUSB1, JUSB2).

I also have external Bluetooth adapter (Tp-Link UB500 BT 5.0) and it works fine. I've uinstall UB500 drivers hoping that resolves problem, but no.

I checked if it is USB controller problem like you said but other devices works normal (mouse, keyboard, USB hubs, cameras, joystick, throttle, driving wheel, pedals, printer, etc.). Ofc they're not plugged in all at once.

For reference my motherboard is MSI X470 GAMING PLUS MAX

  @NoName_2002 

Then there is not much that can be done, I guess.

If possible, you may test the TX55E in another PC to see if it is faulty or not.

Also verify the USB cable that connects the TX55E to the JUSB is not damaged and the wires are in the correct order.