Hi,

For this issue, here is the suggestion:

1) Change your router's 5G channel, on your router, you can try to change the channel to band 1, like use the channel 36, 40 or 44.

2) Confirm your computer's operating system. If the T4UH has the official driver for your computer, please try to update your driver. Uninstall the old driver and then reinstall the latest one, and check whether the computer can connect the 5G network.