Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Quality control issue

I have been purchasing this product for more than 20 years. Over the past 2 years the product has changed, but not for the better. There is more cotton and less wax in the composition of the product. This make the ear plugs less soft. They are also smaller than they used to be and less effective.There appears to be a serious quality control problem. When I received my most recent order 2 of the packages contained the less soft ear plugs while 2 other packages contained the original much softer ear plugs. The softer version is excellent. The harder version is basically worthless. Until their quality control issue is resolved, I do not recommend purchasing this product.