I have the same problem too. I took it to get fixed and blew out again right away. I was told (I hope I say this part right) the break line linkage or something of that source is defective. Kia had the same problem and the manufacture did a recall and fixed it for free. Maybe the same thing with Hyundai.
I have replaced bulb on rear driver brake as well as license plate light multiple times but keeps burning out. Is there a fuse for it somewhere that may be bad or causing that?