[SOLVED] Wifi problems 5GHz (not working)

Echoing @Anachron’s suggestion, it’s also worth adding -f.

journalctl -f

Then try the connection again, see if you can capture an error in real time. Dual band has never been “amazing” on Linux, but there may be environmental factors as well. Worth trying the above command and seeing if a clear error is present.

I had some errors on the log. Rebooting the router and the laptop solved the issue. It did not happened again.

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Delighted to hear this!