mac address of raspberry pi keeps changing
Cause: NetworkManager can randomize your mac
Solution:
sudo touch /etc/NetworkManager/conf.d/100-disable-wifi-mac-randomization.conf
[Paste the following lines in "100-disable-wifi-mac-randomization.conf" and save]
[connection]
wifi.mac-address-randomization=1
[device]
wifi.scan-rand-mac-address=no