Thanks for being a long-time customer. We haven't changed the wax formula - I'm so sorry the product didn't perform to it's usual high standard.
What you've described can sometimes happen with older product. Over time, wax strips can dry out and become less effective, particularly if it has been exposed to moisture, high heat or fluctuating storage conditions.
We'd appreciate the opportunity to make things right. If you could contact us at hello@parissa.com with the batch number from the package, we'd be happy to investigate and help. It's important to us that you're satisfied with our product results.