Netgear Mesh AX1600 EAX12 loses wifi connection

Hi, my main router is a ZTE H2640, I installed the latest firmware on the extender, my house is about 140 square meters, but in any case the problem is that it also disconnects from devices that are within a couple of meters , in practice the green light of the "wifi" turns off and after 10-20 seconds it turns on again, between the main router and the extender there is only one concrete wall that has never given me problems even with an old repeater that i had no easymesh technology and another brand. I configured the extender via WPS because unfortunately the app didn't work and I had to do it this way