WIFI Disconnect after MQTT Login (ESP32)

Hello

I have upgraded my Router from the Original ISP Router (magenta connect box) to a Netgear Nighthawk AX4 (RAX40)

I have a home Automatization system at home, and I am running HASSIO on my network.

With the old Router everything is fine but since I have upgraded the ESP32 losses WIFI after it connects to the MQTT. All This has works before and still runs on my other ESP8266 chips.

Also, If I connect direct to the AX4 WIFI it does not work but if I connect to a separate WIFI router (same Internal Network) it works fine.

Is there a Setting that can cause this?