Mac Address disappeared?!?

I keep getting an error message to turn off my 3ds and power back on. I could not figure out why since it would randomly pop up no matter where I was or what I tried to do. I then tried to isolate the issue and found it to be inside the internet / streetpass area since my system works normally with the internet disabled. I got through quickly enough with internet engaged and find my mac address is all zeros. How is this possible and how can I fix this issue since ( I can only assume ) I am unable to get online at present without such an address to identify my 3ds? Should multiple 3ds systems be needed to resolve my problem.... I do have 2 other 3DS-XL systems that I can use to repair this one with the errors. Any suggestions or info anyone could provide would be much appreciated. I thank you and have a great day!