My best guess is that you are trying to hard to keep it burning, and making it too hot... Which is a symptom of tobacco that is too wet, as mentioned by Zurg and Tracmyer. Waiting for cigars to drop to 65% becomes easier as your supply increases.

That being said, I have some Tat Noella Reservas that I cant wait to get my greedy little paws on... Just have to hang in there for a couple more weeks LOL