"last link up" empty

Hi guys,

I have 8 Mikrotik Metal 2SHPn installed in a bus terminal and the wifi of one of them is not working :frowning:
Comparing the configuration of the one that is not working with the rest, the ONLY difference I found is that in the property of the wireless interface I see the field ‘last link up’ empty, any idea why? the settings are identical with the rest!
Thanks!!