Connection problem with 5Ghz frequency

Hello,
I have a problem connecting to the 5Ghz frequency with my Chateau router.
I have no more connection with this frequency, whereas I had no problem before today.

I have logged into the router’s WebFig and I notice that in my wlan2 (5Ghz) I am not receiving any data.

Is this a problem for other people? And if so, how can I fix it?

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Thank you very much for your help.

PS: I have version 7.3.1 RouterOS