It could be that the blend changed or the batch was bad, but it could also be your palette? Sometimes I go on a streak where I enjoy one type of smoke for a while and then suddenly find them flat or out of whack. I'd say try revisiting them in a little bit. Sounds frustrating when your go-to changes in flavor. Another question I had is are you changing the type of drink you are having with the smokes? That can also affect it. The same goes with what you eat before it.
Good insight and ideas that I considered, but found to be irrelevant. Once I started noticing what I thought was a change in the profile, I went out of my way to make sure I wasn't eating or drinking anything that could be skewing my perception. I also considered the fact that my tastes may have changed and that could be the case but I am doubtful. I have a handful more and I will continue to smoke through them to see if I am mistaken, I hope I am because these were a favorite of mine.