Anejo issue

[kcdeadmoney]

First of all, allow me to say hello to everyone as this is my first post. I searched through a lot of the other cigar forums and this one seems to be the most down to earth.

Now to my question. I still consider myself a bit of a noob as I have only been smoking for a year and a half, so I am still encountering many new things. My local B&M still had some AF Anejos in stock so I decided it was time to try one. The first third was as expected, only better. Somewhere about half way through the second third the stick started to develope a dark brown, somewhat thick, bitter tasting tar/oil. This compounded throughout the rest of the smoke and eventually I was forced to lay this stick to rest as the draw became non-existant from becoming clogged. Any ideas what could have caused this? Thank you!