First, in case you did not know, there is a Z390 forum which may have more info.
In my system, I have never used the Bluetooth network since it does not connect to Bluetooth devices such as headsets. Are you using it to connect to other devices , such as computers or maybe phones and such?
I would not think your Bluetooth has stopped working but you may need to reinstall the Wi-Fi and Bluetooth drivers for that device.
Maximus Z790 Hero,
Intel i9-13900k
Intel AX411