Sucks for sure. Yes, being alerted would be nice so at least you're not surprised but it really doesn't help the problem of consistency. When I had my web store, I had so many small supplier go out of business that I put a note above each category that said fragrance oils are not always consistent from batch to batch. Not sure it really helped, but at least I was warning them about changes. I've really never had a batch problem with oils changing, just suppliers closing and using replacements. I lost a few really good customers when one supplier closed, I never could find good replacements.