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Ok, I think that it is better to resolve one problem at a time.
The device with the MAC address 9c:30:5b:d3:67:47 is my Windows 10 PC and it periodically disconnects from the AR750S, this doesn’t seem to be happening right now with my android phone.
Is it possible to obtain a more detailed log?
I tried to connect to the AR750S while its WAN port was disconnected and the WiFi connection was equally unstable.
Finally, I forgot to mention that I am using WiFi network whom SSID is hidden, I will do some tests with a “normal” WiFi network.