i have booted kalilinux in usb persistenece , when i run airmon-ng, wifi connection goes off and it shows wifi adpater isnt connected or something like that and when i reboot again then it shows wifi adapter is available ,what should i do?
it's normal behavior of this command. You turn your main wlan device into monitor mode so it only scans for nearby networks. There is nothing wrong with it. You just don't understand how it works.