Copy NetworkManager.conf to NetworkManager.conf.bak to create a backup.
Add these lines below to NetworkManager.conf and ADD YOUR ADAPTER MAC below [keyfile].
This will make the Network-Manager ignore the device, and therefore don't cause problems.
[device]
wifi.scan-rand-mac-address=no
[ifupdown]
managed=false
[connection]
wifi.powersave=0
[main]
plugins=keyfile
[keyfile]
unmanaged-devices=A0:B1:C2:D3:E4:F5