Default [Q] MAC adress changes every restart of WiFi

Hello,

There are solutions for this issue, but I haven't found working one for my phone.

The problem is that MAC address of WiFi changes last three pairs of hex numbers every time i restart WiFi. Because of that, I face troubles with configuring router: DHCP reservation for example.

The phone:
Just5 Spacer
Android version 4.2.2
kernel version 3.4.5

Phone is rooted.

MAC changer apps, at least popular ones, do not help.

Have anyone some ideas?