I watched a Balvenie video once that talked about how they get letters from fans sometimes that say "oi this last bottle was different from the last, wtf" and their reply is "aye, shit's organic, innit" which has been my experience in, well, life, really.
That being said, every bottle of Lagavulin I've had (only about 4 total), unlike any other scotch, ever, has slapped me in the face and called me a bitch.