Hi nandhp I had a similar problem and solved it by using tails [1] solution: Using udev to change the mac address. Do you have the possibility to test whether it solves your problem?
The idea is to:
1/ disable package auto change in /etc/default/macchanger by setting
ENABLE_INTERFACES=""
2/ Create a file /lib/udev/rules.d/00-mac-spoof.rules with:
# Note: ATTR{type}=="1" means ethernet (ARPHDR_ETHER, see Linux'
# sources, beginning of include/linux/if_arp.h)
SUBSYSTEM=="net", ACTION=="add", ATTR{type}=="1",
RUN+="/usr/bin/macchanger -A $name"
(This is 3 lines with the third one being long).
Does that solves your problem?
-- Nirgal
[1] https://tails.boum.org/
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