@ Britelite
In my case it toggeld to the right MAC every now and then. But I haven't managed to discover the underlying mechanism - the 1:8 was a raw guess. Don't forget to not only reboot, but disconnect the Efika from power, so that capacitors all get discharged.
But I agree it sucks (why on earth the batteries used for teh Efeika run so fast out of voltage and, 2nd, why on freaking earth does teh NIC loses its MAC then (given teh idea that the MAC should be a *constant*)?!).
If setting the MAC manually doesn't help, maybe you can just insert the new battery and get a new constant MAC and ask some team member on #morphos if a new reg key can be issued for your new, then constant (as long as the battery lives!) MAC.
Edit: Britelite, note the pm I sent you.