Host NOT reconnecting after WIFI lost

[chercheur]

Hello,

I've installed an onboard WIFI module (HLK-RM04) into my mower  :-) 
It connects to one of my WIFI access point.

It is configured with a fixed IP in pfsense in the DHCP section.

When an unreachable WIFI zone is reached….it looses contact with the WIFI access point.
The device is configured to automatically reconnect : no timeout

Most often it simply never comes back.
I was suspecting the WIFI module but I noticed that if I reboot the access point...it's alive again.

So, in the end, it is not (I think) a pfsense issue but more a WIFI related issue.
In my understanding the device is always trying to get its WIFI link...but why does an access point reboot trigger that reconnection ?
I tried this with 2 different access points.

Tx for your attention :-)