I've heard this before but you didn't tell the forum about your call to Samsung.
Overnight my smart tv disconnected to the wifi. Now it says me "Bad MAC address, please contact Samsung support".
I done several resets but it still doesn't work.
I also changed of wifi points, unsuccessful.
Furthermore, i can't change wifi settings, i have to reset it and change settings at first launch.
When i try to connect, i can see that my MAC address is 00:00:00:00:00:00:00
My model : UE32K5500AKXZF